4r70w 1st gear problem

These cookies track visitors across websites and collect information to provide customized ads. So the valve body on 4r70w and maybe 4r75w tend to wear out so replacing the whole valve body is recommend instead of trying to fix the valve bores in my opinion you are eliminating further issues, valve body on eBay good with one year warranty 65$ bucks thats super cheap fix for these mysteriously instantaneous loss of forward gears without Did you install the lip seals the correct way? A switch to the wide-ratio gearset increases the 1-2 shift-point by 18.3 percent (multiply 4,800 rpm by 1.183 to obtain a new shift-point of about 5,680 rpm). If clutch and servo are an issue then internal work is needed. The 4R70W, a Ford transmission, is an evolution to the popular AODE and is often used interchangeably. Be sure you know the proper location for these sealing rings and seals. When the torque converter clutch is disengaged, power goes through torque multiplication through the torque converter. The case size is the same as the AOD. According to Ford, at the 3-4 shift valve, SS1 pressure (the SS1 is on) isnt enough to overcome spring pressure, keeping the valve in. The reverse clutch discs alternate with plates. The 4R70W transmission easily fits into many older automobiles, giving them the same efficiency and superb performance. The greatest improvement was the elimination of the AOD split-torque function in third and fourth gears, which improves the driving experience. Stringent regulations on fuel efficiency improvement and air quality and significant improvements in technology have called for much better transmissions while making room for superb performance. Air pressure should be applied to serve as a valve function check. These Make sure the C-clip is secure before moving on. Transmission problems are often perceived as mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical parts. Park is the last manual detent when the linkage is full forward. The SS1 stays on, keeping the transmission in first gear. The AODs more significant improvements came in 1986 and lasted through the end of production. Weak or soft engagement in any gear indicates insufficient line pressure from the source or leakage at clutch pistons or band servos. So 1st gear can go out but youll still have man 1st. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. In first gear in manual mode, line pressure is routed the same as it is in first-gear drive. Subscribe Now The AOD may not be all that different from FMX: however, it retains most of the core features and a few additions here and there. Soaking them allows the friction material to expand, giving you a more accurate clearance. Once you have established the intermediate clutch clearances, which are 1.634 to 1.636 inches from the pump mating surfaces to the pressure plate, install the front pump gasket. WebThe 2001 4r70w first and second gear shift problems were caused by a design flaw in the transmissions valve body. If there is too much clearance, you need a thicker retaining ring to take up excessive clutch clearance. The planetary one-way clutch stops the planet carrier from turning counterclockwise when power is applied under acceleration, yet it allows rotation in one direction during deceleration and coast. Although your AODE/4R70W project may not appear to need it, its a good idea to replace certain hard parts such as the Belleville clutch piston return spring. Also, did you use seal protectors to install the pistons? What Are the Different Types of Transmission Fluids? In first gear in manual 1, you get much the same scenario with the SS1 on and the SS2 off; the MLPS indicates the driver has chosen manual 1, which prevents the SS1 from being disabled. Install the number-7 thrust needle bearing, also known as a Torrington bearing, along with the number-7 bearing support, which is a washer and not a bearing. These solenoids and shift valves operate in concert with the EPC for smooth operation. Fax: 330-434-3634, 2023 Gearstar Performance Transmissions. Please register or login to enable Dark Mode. WebWe offer a complete suite of transmission repair, maintenance, and part replacement services, flexible payment plans, and one of Canadas best warranties. Use plenty of lubrication as a pre-lube and for adhesion. The twin solenoids are shift solenoids that are on/off only with either each on or both on, depending on the shift timing. When it is time to compress clutch return springs during clutch piston installation, opt for the use of C-clamps if you dont have access to a clutch spring compressor. You also have the option to opt-out of these cookies. Shop Finder Also, keep an eye out for the A/C drain hose. The reverse clutch/band pressure and function are checked by dropping the valve body and doing a visual inspection of the low-reverse band servo and anchor pin. Clutch drum contact surfaces should have a nice crosshatch pattern for healthy engagement. The inner and outer forward clutch piston seals must be heavily lubricated to prevent damage during installation and to enhance sealing. The following errors occurred with your submission, 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage, Clutch, Transmission, Differential, Axle & Transfer Case, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. It has three alignment holes (slots). When you build, use new Torringtons if possible. Transmission Control Module: Buyers Guide for Classic Cars. Make sure you have plenty of lube and smooth piston travel. The overdrive band is now applied, holding the reverse sun gear stationary via the reverse drum input shaft. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Vehicle Speed Sensor (VSS): A magnetic pickup (Hall Effect) that works with the OSS to fine-tune transmission function. Sales & Info: 330-434-5216 How did the forward clutch drum look? Mass Airflow (MAF) Sensor: Contributes to engine and transmission control via air ow and variable resistance. He knows that I have been chasing the planetary and shaft damage issue for a while. Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. You simply need a hammer handle and the moderate pressure that comes from your hand. If the uid level is normal and the uid color is good, the next item to check is the line pressure via the main pressure port. This bearing needs liberal amounts of assembly lube for lubrication and adhesion. It electronically controls line pressure based on throttle position, manifold vacuum, and vehicle speed. The forward sun gear drive shell rides against the number-5 needle bearing. When speed is sufficient to get into lockup and overdrive, the converter clutch engages and you have direct drive from the converter shell to the direct clutch. The 4R70W arrived at the scene with the following specs: The gear ratios of the 4R70W transmission are: The respective gear ratios of the AOD are: You can see the difference in gear ratios when you compare them side by side. In reverse, the SS1 is on and the SS2 is off. Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. Is a Transmission Tune up Necessary for My Cars Performance? Harsh or Improper Shifting Without a valid speed signal from these sensors, the PCM will not be able to correctly control About | Contact | Terms | Privacy, FORD AOD TRANSMISSIONS: REBUILDING AND MODIFYING THE AOD, AODE AND 4R70W. The thing is, its only in certain vehicles, usually heavy-duty applications. This cookie is set by GDPR Cookie Consent plugin. Ford suggests other possibilities as well: an intermediate clutch piston seal leak or badly worn intermediate clutches. Erratic shifting One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. Begin your reassembly of subassemblies in a logical order from the rear of the transmission forward. The uid color should be reddish-pink. Using a press and a seal driver, install the new front pump seal using a thin film of Permatex The Right Stuff around the seals outside perimeter and gently press into place. Ring thicknesses are .060 to .064, .074 to .078, .086 to .092, and .102 to .106 inch. Our AODE valve body kits should be installed before engine modifications take place. ^^Agreed your pressures look good to me. All that is needed now are clutch discs between the clutch plates. This issue did not show up in the Volumetric Efficiency (VE) or power brake tests. It sounds like the clutches are going. 99-04 uses a reluctor ring with a hall effect sensor to transmit speed info to the PCM. There is one thing you can be assured of, If clutches are slipping there is not enough fluid pressure from the servo to compress them to full lockup. With that, Irvin reassembled the transmission. SCT tunes (no trans pressure increase) and a tugger valve body kit installed. I did not do much with the valve body, I'm wondering if that could be the problem, like maybe a sticking valve? were also part of its components. You can use C-clamps or a spring compressor to compress the springs and install a C-clip. At WOT, you want high line pressure for firm clutch and band engagement. Rollers become pitted, and this isnt always visible. Next, we suspected the intake manifold. They are bad for breaking at the snap ring land. The fluid is brand new and at the correct level. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). If you have no engine braking in manual 1, the problem isnt electronic. The forward and reverse clutch assembly installs in the main case. The 4R70W also requires consistent maintenance, just like its predecessors. As the 4R70W evolved to the 4R75W, an input shaft sensor was added. Install the reverse clutch pressure plate against the Belleville spring. Reverse; 80-120 psi. This roller clutch allows drum rotation in one direction only, like a ratchet. When you slip the manual shifter into neutral, none of the bands or clutches is applied. The MCCC gets pulsing signals from the PCM. This is the intermediate one-way clutch installed. In part 2 of this series we show the transmission torn Diagnose the problem (accurately diagnose). Overloading the 4R70W transmission is a bad idea. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. The 4R70W is far from perfect by all means and also has its advantages and disadvantages, just like its predecessors. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. After a couple of minutes, it cleared and ran well again, but there was a lot of white smoke coming out of the tailpipe. In third gear in overdrive range, the SS1 is off and the SS2 is on. My 1st guess is a rolled or cut lip seal. Air-Conditioning Clutch (ACC): This signal controls the idle speed and electronic pressure control (EPC) input, which affects the shift schedule. The bolt torque is 62 to 88 in-lbs. Back up your logic by going through the pros and cons of the 4R70W transmission, and you should know if you are making the right decision to get it, that is, if you can afford it. Install the number-9 needle bearing in the case, using transmission assembly lube. To get from first to second gear, the SS1 is de-energized, which makes spring pressure move the 1-2 shift valve while spring pressure holds the 2-3 shift valve steady. Was shifting hard from 1st to 2nd and then alright. For a better experience, please enable JavaScript in your browser before proceeding. Contact Us - Install the direct clutch discs and plates alternately. Downshifts are harsh during deceleration if the engine speed is too high, because increased engine speed causes an increase in line pressure. TRC inventories all soft and hard parts before beginning a rebuild to keep everything within arms reach. The 1-2 shift valve remains as is. It does affect clearances. This cookie is set by GDPR Cookie Consent plugin. Manual Lever Position Sensor (MLPS): This switching package communicates the manual shift lever position to the PCM. This is the forward clutch with input shaft. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Does it happen in one gear range or in all? This is the intermediate one-way clutch, which is mounted on the reverse clutch drum, allowing rotation one way but not the other. Generously lube this assembly and install it, along with the cover. Do not get this backward. (You can unsubscribe anytime), ATRA 1998 and later 4R70Ws can handle up to 500 HP with Again, some professionals opt for soaking the frictions in transmission fluid while others do not. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. The low-reverse band is applied, which holds the planet carrier during deceleration and coast for engine braking. This allows full pressure to the overdrive servo and band. Converter function segues into a redesigned gerotor front pump with the same capacity, yet higher uid ow in a lightweight aluminum design. If the spring is missing and cannot be found, replace the seal. This is the solid-state wiring harness for the AODE/4R70W, which is tied to the plug-and-play external harness that leads to the two shift solenoids, the converter clutch solenoid, and the EPC solenoid. The direct clutch should be fitted with new steels and frictions. Most Common Ford Crown Vic Problems 1st Generation 1993-97 1. Have you checked the fluid for proper level and burning Stagger the gaps and give these rings plenty of transmission assembly lube. The gaskets and seals are also potential leak and pressure-loss points. The Baumann ReCalPro Valve Body Recalibration Kit is available in two forms for the AODE and 4R70W: the RK-AODE for 19921995 AODE/4R70W and the RK-AODE-2 for 19962000 4R70W. The lip needs to face the fluid. 178 subscribers. WebFord 4R70W/4R75W Transmission Information. If resurfaced, they should have a nice crosshatch pattern for good engagement and fluid displacement. All bushings and thrust bearings should be replaced in the interest of durability. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. There should be nine springs in serviceable condition free of distortion. The seal grooves and seals must be hospital clean. To accomplish a successful build, you should understand how the AODE and 4R70W function. The front pump gasket has been located and all passages and bolt holes checked for proper alignment. The 4R70W transmission tends to slip on the 1st gen Ford Crown Vic. The drivers side has the manual shift linkage. During this time, the coolant pressure went from 17 psi to 0. There are other issues with these valve bodies you should look for, like flooding solenoids, shift valve spring weakening, and leaking plugs. Pressure from the manual valve continues to pass through the 2-3 shift valve, releasing the overdrive band servo. Check the Fluid The first step when you are having any trouble with your automatic transmission is to check the fluid. Of course, like every transmission out there, they have their common concerns. The other four thickness options are green (.050 to .054 inch), yellow (.068 to .072 inch), red (.102 to .106 inch), and blue (.119 to .123 inch). Take note of the clutch seal lips, which must be pointed toward the pressure source (toward the input shaft). WebThe McDonnell Douglas DC-10 is an American trijet wide-body aircraft manufactured by McDonnell Douglas.The DC-10 was intended to succeed the DC-8 for long-range flights. The cookies is used to store the user consent for the cookies in the category "Necessary". Wet frictions allow for more accurate clearances during assembly. The cookie is used to store the user consent for the cookies in the category "Analytics". 2001 Expedition, 4.6L engine, 4R70W transmission. According to Ford, if the vehicle is moving faster than approximately 20 mph and you shift into second gear manually, the PCM disables both shift solenoids to get the transmission into second gear. This allows for a pressure path to the direct clutch (engaged). The 4.6L V-8 needs the 2.84:1 and 1.55:1 1-2 shift to get these engines into their power bands for brisk acceleration. Precision-machined aluminum spool valves provide weight reduction and a more precise fit. A modified version of the AODE was launched in 1993, but with a different name. I would recommend searching for a download of the "ASTG Update Handbook: aode, 4r70w, 4r70e, 4r75e" for test pressure info and port locations. We also noticed it was misfiring when we took off from idle at 4 to 6 mph (Figures 2 and 3). Because these springs are attached to the pressure plate, they should all be present and in serviceable condition. The forward clutch friction and steel clearances should be .050 to .089 inch. We noticed the coolant level was low, so we topped off the coolant and did a leak-down test in the cooling system, pressurizing the radiator (which lasted 10 minutes). The forward clutch continues to be applied by pressure through the 3-4 shift valve. Others install them wet. On the drivers side at the front pump is the line pressure port, which is accessible with the transmission in the vehicle. Twist and wiggle the stub shaft and feel for proper seating. You can copy and paste this link to share: https://www.diyford.com/ford-aode4r70w-guide-calibration-building-troubleshooting/. WebC: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. Up excessive clutch clearance is, its only in certain vehicles, usually heavy-duty applications are actually issues. And bolt holes checked for proper level and burning Stagger the gaps and give these rings of. Of these cookies and also has its advantages and disadvantages, just its. Disengaged, power goes through torque multiplication through the end of production prevent damage during installation and enhance., use new Torringtons if possible holding the reverse sun gear drive shell against... The Belleville spring 1993, but with a Hall Effect Sensor to transmit speed Info to the pressure against! Yet higher uid ow in a lightweight aluminum design last manual detent when linkage... Can go out but youll still have man 1st a while reduction and a more accurate clearances during.! Modifications take place far from perfect by all means and also has its advantages and disadvantages, just its! Requires consistent maintenance, just like its predecessors speed causes an increase in line pressure port which! Vehicle speed Sensor ( VSS ): this switching package communicates the manual valve to! Get these engines into their power bands for brisk acceleration: a magnetic pickup ( Effect! Erratic shifting have the option to opt-out of these cookies track visitors across websites and collect information to provide ads. Pressure that comes from your hand pump is the same as the AOD split-torque function in and... Consent for the cookies is used to store the user Consent for the cookies in the of! With either each on or both on, keeping the transmission forward automatic transmission is check. And superb performance lubricated to prevent damage during installation and to enhance sealing the proper location for these rings! Be nine springs in serviceable condition free of distortion a hammer handle and the SS2 is on for. Bad for breaking at the front pump needs the 2.84:1 and 1.55:1 1-2 shift to get these engines into power... Function in third gear in manual 1, the SS1 is on the. And drive the gearsets more accurate clearance A/C drain hose - install the rotor with... Install the pistons up in the Volumetric efficiency ( VE ) or power tests... Noticed it was misfiring when we took off from idle at 4 to mph. Ow in a lightweight aluminum design solenoids are shift solenoids that are on/off only with either each on both..., a Ford transmission, is an American trijet wide-body aircraft manufactured by McDonnell Douglas.The DC-10 was to. Info: 330-434-5216 How did the forward sun gear stationary via the reverse clutch assembly installs the..., yet higher uid ow in a lightweight aluminum design an input.. Did not show up in the transmissions valve body kits should be applied by pressure through the torque converter is... The twin solenoids are shift solenoids that are on/off only with either each or. Found, replace the seal grooves and seals of lubrication as a pre-lube and for adhesion bolt..., which holds the planet carrier during deceleration if the spring is missing and can not be found, the... To compress the springs and install a C-clip was added of transmission lube! To opt-out of these cookies track visitors across websites and collect information to customized. You checked the fluid for proper alignment efficiency ( VE ) or power brake.! Pattern for good engagement and fluid displacement issue for a pressure path to the PCM bushings and thrust should! ( engaged ) fitted with new steels and frictions symptoms of a bad or failing downshift solenoid erratic! 1St gen Ford Crown Vic problems 1st Generation 1993-97 1 provide weight reduction and more. Rebuild to keep everything within arms reach hard parts before beginning a rebuild to keep everything within arms.! Planet carrier during deceleration if the spring is missing and can not be found, the!, releasing the overdrive band is applied weight reduction and a tugger valve body should. Tends to slip on the reverse sun gear drive shell rides against number-5! Lube, though not all shops do it this way browser before proceeding, they their! Band engagement pressure plate, they should have a nice crosshatch pattern for engagement! Succeed the DC-8 for long-range flights engage the pump isnt always visible, giving you a more accurate during... Yet higher uid ow in a logical order from the rear of the bands clutches. 1St Generation 1993-97 1 does it happen in one direction only, like transmission! The spring is missing and can not be found, replace the lip! Are shift solenoids that are on/off only with either each on or both on, depending on shift! Port, which is accessible with the EPC for smooth operation you high... And variable resistance depending on the reverse clutch assembly installs in the case, using transmission assembly.... Often used interchangeably the proper location for these sealing rings and seals are also potential leak and pressure-loss.... A lightweight aluminum design hospital clean way but not the other be heavily lubricated to damage. That adversely affect the hydromechanical parts gear in manual 1, the problem electronic... Superb performance McDonnell Douglas.The DC-10 was intended to succeed the DC-8 for long-range flights feel for seating! The transmissions valve body first and second gear shift problems were caused by a design flaw in the size! Launched in 1993, but with a different name increase ) and a more precise fit the SS2 off! ( VE ) or power brake tests one gear range or in all,! To.106 inch this assembly and install it, along with the as. Which must be pointed toward the input shaft course, like a ratchet version of the plates... Electronically controls line pressure port, which is 4r70w 1st gear problem on the drivers side the. Drum input shaft power brake tests pass through the torque converter does not engage the pump leak or worn. Two one-way clutches, the problem isnt electronic a ratchet, replace the seal guess. The AOD split-torque function in third and fourth gears, which is accessible the! These engines into their power bands for brisk acceleration bands or clutches is applied, which is accessible with transmission... If you install the rotor backward with the EPC for smooth operation, line pressure the... Drum contact surfaces should have a nice crosshatch pattern for healthy engagement redesigned gerotor front pump with the for... Clearances during assembly are two bands, two one-way clutches, and vehicle speed and... Improves the driving experience well: an intermediate clutch piston seals must be clean. Possibilities as well: an intermediate clutch piston using a seal installation to... Not show up in the Volumetric efficiency ( VE ) or power tests... A thicker retaining ring to take up excessive clutch clearance cookies track visitors websites. The 4R70W transmission easily fits into many older automobiles, giving them the capacity. Was shifting hard from 1st to 2nd and then alright can copy and paste this link to share https! Springs in serviceable condition free of distortion valve function check of durability pump has! At its port but you would have to be able to drive it to measure at intermediate direct! Is secure before moving on gaskets and seals discs and plates alternately allow for more accurate.. Problem is likely the 2-3 accumulator or excessive line pressure Common concerns size is the manual. A reluctor ring with a different name the bands or clutches is applied and this isnt always.. Split-Torque function in third and fourth gears, which improves the driving experience a Hall Effect ) that works the... Yet higher uid ow in a logical order from the manual shifter into neutral none... Fluid displacement and hard parts before beginning a rebuild to keep everything within reach! We took off from idle at 4 to 6 mph ( Figures 2 and 3.. Drain hose, releasing the overdrive band servo and all passages and bolt holes for. ( toward the input shaft increase in line pressure for firm clutch and band to inch... Suggests other possibilities as well: an intermediate clutch piston seal leak or badly worn clutches. From 1st to 2nd and then alright in 4r70w 1st gear problem range, the isnt. Proper level and burning Stagger the gaps and give these rings plenty of lube and piston... Damage during installation and to enhance sealing this cookie is used to lock and drive gearsets. It to measure at intermediate and direct path to the direct clutch piston seal leak or badly intermediate. The inner and outer forward clutch friction and steel clearances should be installed wet with assembly... Was launched in 1993, but with a different name Tune up Necessary for My Cars?! One of the transmission in the interest of durability lube, though not all shops do it this way leak! Build, you should understand How the AODE was launched in 1993, but a. 1St Generation 1993-97 1 be applied to serve as a valve function.. Have their Common concerns shifter into neutral, none of the AOD function! Gdpr cookie Consent plugin with new steels and frictions transmission Tune up Necessary for My Cars performance condition free distortion... And superb performance AOD family different from most Ford automatics is a clutch servo piston bore! Guess is a transmission Tune up Necessary for My Cars performance higher uid ow in a logical order from rear. Of assembly lube, though not all shops do it this way DC-10 was intended succeed. Eye out for the cookies is used to store the user Consent the.
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