It can also mean reverse clutch piston seal problems. Step 7: Install Reverse Clutch Plates Lay the clutch discs and plates into the reverse clutch drum. Step 3: Install 2-3 Accumulator Piston and Spring The 2-3 shift accumulator assembly contains and builds pressure for a firmer 2-3 upshift. Once pressure leaves the pump, its first destination is the manual shift valve, which is the traffic cop for line pressure. This shaft operates inside the outer stub shaft. Darkness indicates contamination and overheating.
Although these clutches are dry, some transmission professionals prefer to soak them in transmission fluid first to get accurate clearances and the best results. When compared to its predecessor the 4R70W has lower 1st and 2nd gears. Locks up good on the street. If it is brown or otherwise dark in color that is a clue. Make sure you have plenty of lube and smooth piston travel. This sensor could cause erratic shifting.
We also offer an upgraded version of this shaft. Reverse Clutch Assembly Step 1: Install Number-9 Needle Bearing Install the number-9 needle bearing in the case, using transmission assembly lube. All seals must be generously lubricated and installed properly for effective sealing. The color and location of the stock accumulator springs varies by model year, vehicle type, and factory calibration. If resurfaced, they should have a nice crosshatch pattern for good engagement and fluid displacement.
The intermediate clutch is applied without being a part of power transfer. Reverse Gear and Neutral The reverse clutch is applied, connecting the input shaft to the reverse sun gear. As a result, Ford engineers added a spring to give the 3-4 shift valve a helping hand. 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. Pressure against the seal lip is self-sealing and fail-safe. Make sure it remains centered during installation.
This plate has an adjustable orifice to change the airflow through the idle air motor to help with idle surges. Increasing the rpm stall speed of your Mustangs torque converter will result in the engine reaching the powerband earlier, providing quicker acceleration and lower elapsed times. However, for the sake of longevity, replace yours. For example, the Baumann ReCalPro Valve Body Recalibration Kit works very well for shift improvement and durability, resulting from increased line pressure that ensures firm clutch and band engagement without destructive slippage. Certain models also have hardened gears, such as the 1998 and later 5. Step 6: Install Reverse Clutch Pressure Plate Install the reverse clutch pressure plate against the Belleville spring. In final drive, however, power passes through the unit differently.
Any scoring, especially scoring that snags your fingernail, is grounds for replacement. Step 7: Install Forward Sun Gear This is the forward sun gear stub shaft, which fits into the heart of the planet carrier. Step 4: Inspect Solenoids The standalone solenoid is for torque converter lockup via solid input or pulsing duty cycle. The drive shell is fully seated and ready for the intermediate stub shaft. When the brake is pressed the computer will momentarily disengage the converter clutch. It can operate at zero duty cycle valve closed or maximum duty cycle valve wide open.
These converters are just the ticket for high horsepower street application provided you have proper cooling and gear ratio. We will answer your question by email, and post the question and answer here for anyone else that needs to know. Stall speeds of 1000 to 2000 over stock converters can be expected. This lack of engine braking will make first or second feel like neutral if the vehicle speed is high enough. 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? Either way, the solenoid will need to be replaced. When you apply pressure to this piston it acts on the intermediate clutch pack. The lockup torque converter of these transmissions can actually be turned on and off by the electronics.
The identification plate includes the serial number, assembly number, model year, model, and engine size. Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. Paul did an amazing job walking me through the whole process. Take note of how the rollers fit into the cage. Give these rings and grooves abundant lubrication. One planetary member is driven while the other is held.
The 2-3 back-out valve, as the name implies, regulates the feel of a 2-3 upshift. A quick-lube place put in the non synthetic Mercon, and it only lasted about 5K before the shudder came back. You want to get yourself an ohm meter you probably already have one in your tool box. We will answer your question by email, and post the question and answer here for anyone else that needs to know. Are you looking for 4R70W transmission troubleshooting help, 4R70W rebuilding tips, 4R70W technical service bulletins, 4R70W diagnostics or technical information? Step 7: Install Forward Clutch Steels Alternate the forward clutch plates with clutch friction discs. ? No longer do you have to decide between streetability and performance. This same noise can be caused by forming in the fluid as the pump starts to fail.
Another possibility is a leaking 1-2 accumulator cover or piston seal. If the seal lips are pointed away from the pressure source, the clutch cylinder does not maintain pressure and does not function. The issue will disappear as the system begins to warm up. Step 16: Compare Main Case and Pump Passages There is only one way to install the front pump. Never use sealer on any transmission gaskets; it is not compatible with transmission fluid and can block passages. Soak this bearing in transmission assembly lube and make sure it sticks to the case.