4r70w 1st gear problem4r70w 1st gear problem

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. These 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. How did the forward clutch drum look? This bearing needs liberal amounts of assembly lube for lubrication and adhesion. The 2-3 shift valve moves under pressure against spring pressure. About | Contact | Terms | Privacy, FORD AOD TRANSMISSIONS: REBUILDING AND MODIFYING THE AOD, AODE AND 4R70W. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). The lap joint must meet head-on and be perfectly aligned. Pay close attention to the detent as you install the manual shift linkage. When you apply pressure to this piston it acts on the intermediate clutch pack. Transmission problems are often perceived as mechanical or hydraulic when they are actually electrical issues that adversely affect the hydromechanical parts. Be sure you know the proper location for these sealing rings and seals. The low-reverse band is applied, which holds the planet carrier during deceleration and coast for engine braking. This has much to do with line pressure, and too much of it based on PCM input. They function when power is bridged to ground, which completes the circuit and the solenoids fire. Troubleshooting the AODE/ 4R70W begins with ascertaining the problem. Check the uid level and line pressure. Parts: 330-434-0104 Although you can swap AOD-E and 4R70W geartrain components into an AOD, it makes more sense to opt for the gear ratio advantage of the 4R70W, which is geared more for the Modular engines that dont have the low-end torque pushrod small-blocks have. For This cover contains line pressure at the 1-2 shift accumulator. Park is the last manual detent when the linkage is full forward. 1. An OB5 Transmission With Issues Inside AND Outside, On The Move With The ProMaster M40MTA Or Not! Spring pressure here determines shift firmness. Not enough line pressure and you get slippage. Check the vehicle (visually inspect the vehicle). As mentioned earlier, no stock transmission is perfect in every aspect. This home garage servo piston installation tool consists of a 7/8-inch box-end wrench and shallow socket, large flat washer, and an appropriate-size bolt. Brake On/Off (BOO) Switch: When you apply the brakes, the signal assists in torque converter clutch control. This allows full pressure to the overdrive servo and band. Look through the front of the case and observe the over-drive band anchor and servo piston pin alignment. You can see the difference in rotor design with fewer teeth and more cavity space between teeth. The bottom line is, its important to know how the system works. Adjacent is the converter clutch solenoid, which receives a pulse input for smooth engagement. Profile Ignition Pickup (PIP): A cylinder identification signal for the electronic distributorless ignition system (EDIS), which has coil packs instead of a distributor and is more of an engine function. Make sure you wipe it off and put it back in for a more accurate reading. Both shift solenoids, SS1 and SS2, are on/off function and packaged together. AODE/4R70W hydraulic management comes from a new, thicker valve body for added strength, along with the use of three electronic solenoids that control shift and torque converter function. Too much line pressure and you can break the transmission case. First gear isnt usually the first to go (no pun intended) on the 4r70w. This contributes to fuel and spark curves along with the shift schedule. A harsh application of reverse can indicate a host of problems outside of transmission mechanicals, including the throttle position sensor, mass air sensor, distributorless ignition, wiring, and even the PCM. 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 forward clutch hub splines onto the outer forward sun shell stub shaft. Contact Us - The overdrive band is now applied, holding the reverse sun gear stationary via the reverse drum input shaft. If they are heat cracked or bluish, do not reuse them. Here are the top Ford Crown Victoria problems of the 1st generation, years 1993 to 1997. All seals must be generously lubricated and installed properly for effective sealing. Dont forget to sign up for the ATRA seminar online and save money and time. 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. Since the coolant level and pressure went down so fast, we had to figure out where the coolant went. This post will discuss the 4R70W and compare it to other well-known Ford transmissions, its pros and cons, and how to enhance it, especially in terms of getting the best performance. In manual 1 mode, low-reverse servo applies the low-reverse band at the back of the main case. Cookie Policy - The extension housing received a new bushing. Begin with a plate and alternately stack clutch discs and plates. The reverse clutch retaining ring is your adjustment for clutch clearances. Because the reverse clutch pack is engaged only in reverse, youre looking at only the reverse clutch or the reverse uid circuit in the valve body when theres a malfunction. Check this ring carefully for proper seating. Shop Finder The drivers side has the manual shift linkage. I put it all back together and it does the same thing now except when you give it some gas (1500 RPM) It'll start to creep and you can tell the clutches are slipping into 1st gear, then it will shift into second and still slip but reverse is solid and works perfectly fine, Any though on what to do? To better tie the engine, vehicle, and transmission functions together, Ford went to an output shaft speed sensor and manual shift lever sensor, along with a multiplex electrical connector to simplify service. The intermediate one-way clutch keeps the reverse clutch drum, shell, and reverse sun gear from rotating counterclockwise when power is being applied (acceleration). Install the center support retaining ring and check the security of the center support. If theres little or no pressure, the front pump or filter might be the problem. Others install them wet. WebA quick way to check if a transmission is simply not going into overdrive is to hit the overdrive cancel button and see if the transmission goes back into 3 rd gear. Make sure all holes line up, then mate and secure the pump halves. Make sure the C-clip is secure before moving on. Park gives the same result but also engages the parking pawl. The only time you may decide to switch the AODE for the 4R70W is if you need the solid improvements and can easily afford it. Fit the front pump, then slowly run the bolts down and pull the pump tight. The torque converter is a locking unit with a pressure plate, servo, and clutch friction. Ford developed the AODE and 4R70W to achieve cohesive engine and transmission function in 1991. Necessary cookies are absolutely essential for the website to function properly. Diagnose the problem (accurately diagnose). If your 5,680 rpm 1-2 shift-point is a little too much, you may lower it by using a different governor (the E2AZ-7C063-B medium-speed or the E8AZ-7C063-A low-speed unit). It sounds like the clutches are going. Could have rolled a lip seal. If this cannot be achieved, go with the appropriate retaining ring: .060 to .064, .074 to .078, .088 to .092, or .102 to .106 inch. Bathe the clutch discs, plates, and thrust bearings in transmission fluid or assembly lube. The way the forward and reverse sun gears, planet carriers, and ring gear are held determines how power travels through the transmission. In reverse, the SS1 is on and the SS2 is off. Is the noise or vibration in rhythm with the engine, driveline, or wheels? The 2-3 back-out valve, as the name implies, regulates the feel of a 2-3 upshift. Did you install the lip seals the correct way? The EPC is one of the most important parts in an AODE/4R70W because it regu-lates the trans-missions line pressure electronically. 2. This was a hydraulic transmission with throttle cable and governor.. 1993: (half year, Depending on month produced you could have hydraulic or computer controlled ford transmission) they 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. Torque the gasket bolts to 107 to 132 in-lbs, not ft-lbs. The valve body is responsible for controlling the flow of fluid It electronically controls line pressure based on throttle position, manifold vacuum, and vehicle speed. Keep in mind, Reverse does not use a solenoid 'like' the forward gears. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The MCCC is off (on the torque converter, no lockup). Use plenty of lubrication, then drive the seal in. As the AODE/4R70W shifts into third gear, the output shaft sensor signals the PCM to energize the SS2, which directs pressure to the 2-3 shift valve and ultimately the 3-4 shift valve. 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. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. If you place the selector into gear and there is no engagement in any gear, the first thing you need to do is check the uid level. Lay the clutch discs and plates into the reverse clutch drum. Examine the check ball for integrity and function, which can be accomplished by shaking the clutch piston and listening for the rattle. The uid color should be reddish-pink. For a better experience, please enable JavaScript in your browser before proceeding. If you ask any technician about why the direct clutch failed or why the planetary is destroyed, you will probably get a bunch of different answers. The plates should have a good crosshatch pattern. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. Overloading the 4R70W transmission is a bad idea. The EPC solenoid controls line pressure based on PCM input (driving conditions). It can pop out if it is not completely seated. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction. 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 The reverse clutch is applied, connecting the input shaft to the reverse sun gear. Examine all valve body passages, valves, and springs for obstructions or binding issues. This installs exactly as you see here with a cover and C-clip. The forward clutch friction and steel clearances should be .050 to .089 inch. Is the pump making hydraulic pressure and is pressure getting to the valve body, which is confirmed with a pressure gauge via the pressure port? The twin solenoids are shift solenoids that are on/off only with either each on or both on, depending on the shift timing. Torque the bolts in a strict pattern to prevent warping. In second gear in manual range, both the SS1 and SS2 are off. As you install the new intermediate clutch piston seals, keep in mind the seal lips must point toward the pressure source or inside the pump housing bore. 2001 Expedition, 4.6L engine, 4R70W transmission. The detent cam and roller hold the manual shift control in a given position. No cracks or chips and the snap ring land had no cracks. In third gear in overdrive range, the SS1 is off and the SS2 is on. The shift solenoids open the shift valves when they receive power. Weak or soft engagement in any gear indicates insufficient line pressure from the source or leakage at clutch pistons or band servos. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. The low-reverse band is applied, which holds the planet carrier. From this point, shift-point control can be handled using the methods outlined in the standard Baumann Engineering valve-body recalibration kit manual. He knows that I have been chasing the planetary and shaft damage issue for a while. And that is why you should know what it can and what it cant do. Apply uniform pressure to the piston while feeling for a smooth transition. Staggering the gaps helps the sealing rings hold pressure. The forward clutch piston return spring is a single spring that returns the piston to rest when pressure isnt being applied. One planetary member is driven while the other is held. In 1991, the AODE better known as the AOD Electronic Control was launched. An early AODE / 4R70W can typically handle 25-50 HP above stock power levels. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. If you point the seal lip toward the intermediate clutches, you will have an internal hydraulic leak and no intermediate clutch function. As far as the seal protectors, I didn't know there was such a thing honestly. If the spring is missing and cannot be found, replace the seal. After you add liberal lubrication to the output shaft seal, press it in. Top. The direct clutch should be fitted with new steels and frictions. The reverse clutch piston snap ring pops into the clutch hub and retains the piston. Erratic shifting One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, delayed/no lock-up, harsh 2-3 shift, loss or slipping in forward gears, direct clutch failure or loss of third and fourth gears, low pressure or harsh shifts and front Note the proper installation and how the rollers are located (arrows). Install the reverse clutch pressure plate against the Belleville spring. Next, we suspected the intake manifold. Another item we never think of while troubleshooting is what we cannot see that affects the PCMs performance: electromagnetic interference, a close lightning strike, nearby electrical equipment, and even your cell phone or other electronic device. Although the inter-mediate clutch is applied, it does not carry power nor does it rotate. Online Buyer's Guide Also, keep an eye out for the A/C drain hose. Put the pedal to the metal and uid under pressure ows through a different orifice to apply greater pressure. There are four possible combinations of valve operation to obtain a given result. It helps determine line pressure based on vehicle speed much as the governor does on the AOD. Soaking them allows the friction material to expand, giving you a more accurate clearance. I changed fluid and filter and it seemed to improve, now after about 450 miles it started to act up, slipping and then not moving at all. Ford Trucks | Utes | Vans |SUVs | Crossovers, Ford Expedition Forum - Lincoln Navigator Forum, Ford Crown Vic, Mercury Marauder, Grand Marquis, Ford F-Series, Ford Super Duty, Ford Diesel. Does it happen in one gear range or in all? GearStar Performance Transmission This is the Manual Lever Position Sensor (MLPS), which is tied to the manual shifter. The AOD efficiently replaced several older transmissions that Ford put out, including the C4, C5, and FMX. The cookie is used to store the user consent for the cookies in the category "Analytics". Inspect the reverse clutch Belleville return spring for cracks and distortion prior to installation. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. Privacy Policy. Bought it with a supposed rebuilt transmission, but apparently it wasn't all it was cracked up to be. Electronic Pressure Control (EPC) Solenoid: Your AODE/4R70Ws pace-maker. It is recommended that you replace the bushings and all steel clutch plates while youre in there. A seal lip pointed the wrong way is a guaranteed leaker. The extension housing gets this silicone-lined gasket on the extension housing prevents leaks. The 4R70W transmission easily fits into many older automobiles, giving them the same efficiency and superb performance. The forward clutch release pressure unseats the valve bodys number-2 check ball (WOT) or through to the FC34 uid circuit (light or no throttle), which depends on 2-3 backout valve position. Once you have the converter seated it is If you dont have a press, just about any machine shop has one. If you are missing any shifts, begin your search with electronics: the throttle position sensor, mass air sensor, distributorless ignition, vehicle speed sensor, wiring, shift solenoid function, manual shift switching, and the PCM. If the seal lip is pointed away from the bore, it does not hold pressure and the servo piston does not function. Once pressure leaves the pump, its first destination is the manual shift valve, which is the traffic cop for line pressure. Check the pressure plate for freedom of movement in the clutch drum. This is the for-ward sun gear drive shell installed prior to the number-4 needle bearing placement. It wasnt all that different from the FMX 3-speed automatics since common FMX components such as the Ravigneaux gear train, etc. Reverse; 80-120 psi. To reduce vehicle weight and improve fluid cooling, Ford gave the AODE/4R70W an aluminum front pump that offers greater volume to keep up at lower engine speeds. If these seal ends overlap, you get internal leakage. Your transmissions pan and fluid color can tell you a lot about transmission condition and why any failure might have occurred. Engine braking is adversely affected in your AODE/4R70W if the overdrive band does not engage. Install a new overdrive band and anchor it to the pin. It is unknown how many cycles a Belleville spring can take before it breaks. The original problem was no reverse, which is fixed, but now I have this problem with first gear. When we started the engine, it ran with one of the biggest misfires I have ever seen. However, for the sake of longevity, replace yours. Apply transmission assembly lube on all contact surfaces. Was shifting hard from 1st to 2nd and then alright.

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