General Information
42LE TRANSAXLE
The 42LE Four Speed Transaxle uses fully-adaptive controls. Adaptive controls are those which perform their functions based on real-time feedback sensor information. The transaxle is conventional in the use of hydraulically applied clutches to shift a planetary gear train. It uses electronics to control virtually all other functions.
TRANSAXLE IDENTIFICATION
The 42LE transaxle identification code is printed on a bar code label. The label is located on the transaxle case.
IN-VEHICLE SERVICE
The following is a list of transaxle components the are serviceable in the vehicle:
- Valve Body Assembly
- Solenoid Pack
- Transmission Range Sensor (TRS)
- Input Speed Sensor
- Output Speed Sensor
- Transfer Chain
- Chain Sprockets
- Short (Right) Stub Shaft Seal
- Long (left) Stub Shaft and Ball Bearing
OPERATION
The 42LE transaxle provides forward ratios of 2.84, 1.57, 1.00, and 0.69. The torque converter clutch is available in 2nd, direct, or overdrive gear. The Reverse ratio is 2.21. The Autostick shift lever has five positions (P, R, N, OD, and Autostick).
FLUID LEVEL AND CONDITION
The transmission and differential have separate oil sumps. The transmission sump requires automatic transmission fluid. The differential sump requires petroleum based hypoid gear lube.
TRANSMISSION SUMP
Fluid Level Check
The transaxle sump has a dipstick to check oil similar to most automatic transmissions. The transaxle is located in the rear of the vehicle. To check the transaxle fluid level, lift the deck lid. Pull up on carpeting in the left lower corner. Remove large rubber access plug. Be sure to wipe all dirt from dipstick handle before removing.
The torque converter fills in both the P Park and N Neutral positions. Place the selector lever in P Park to be sure that the fluid level check is accurate. The engine should be running at idle speed for at least one minute, with the vehicle on level ground. At normal operating temperature (approximately 82° C or 180° F), the fluid level is correct if it is in the HOT region (cross-hatched area) on the oil level indicator. The fluid level will be approximately one-quarter inch above the lower hole of the dipstick at 70° F fluid temperature.
NOTE: Engine and Transaxle should be at normal operating temperature before performing this procedure.
Fluid Level Check Using DRB
1. Start engine and apply parking brake.
2. Hook up DRBIII scan tool and select transmission.
3. Select sensors.
4. Read the transmission temperature value.
5. Compare the fluid temperature value with the chart.
6. Adjust transmission fluid level shown on the dipstick according to the chart.
7. Check transmission for leaks.
Low fluid level can cause a variety of conditions because it allows the pump to take in air along with the fluid. As in any hydraulic system, air bubbles make the fluid spongy, therefore, pressures will be low and build up slowly.
Improper filling can also raise the fluid level too high. When the transaxle has too much fluid, the gears churn up foam and cause the same conditions which occur with a low fluid level.
In either case, air bubbles can cause overheating and/or fluid oxidation, and varnishing. This can interfere with normal valve, clutch, and accumulator operation. Foaming can also result in fluid escaping from the transaxle vent where it may be mistaken for a leak.
Along with fluid level, it is important to check the condition of the fluid. When the fluid smells burned, and is contaminated with metal or friction material particles, a complete transaxle recondition is needed. Be sure to examine the fluid on the dipstick closely. If there is any doubt about its condition, drain out a sample for a double check.
After the fluid has been checked, seat the dipstick fully to seal out water and dirt.
The transmission fluid level should be inspected at least every six months.
DIFFERENTIAL SUMP
The differential sump is checked separately from the transmission. A fill plug located on the side of the transaxle must be removed to check fluid level. The fluid should be level with the bottom of the fill hole. The differential capacity is 0.946 liters (32 ounces).
Inspect the differential area during engine oil changes for any leaks. If leakage is present, determine the source of the leak and repair as required. Remove the fill plug and verify the proper level. Adjust if needed.
SELECTION OF LUBRICANTS
It is important that the proper lubricants be used in the 42LE transaxle. MOPAR atf plus 4 (Automatic Transmission Fluid-Type 9602) should be used in the transmission side of the transaxle. Substitute fluids can induce torque converter clutch shudder.
The differential side of the transaxle should be filled with MOPAR petroleum based hypoid gear lubricant 80W-90. Synthetic gear lubricants should not be used.
SPECIAL ADDITIVES
Chrysler Corporation does not recommend the addition of any fluids to the transmission, other than the fluid listed above. An exception to this policy is the use of special dyes to aid in detecting fluid leaks. The use of transmission sealers should be avoided since they may adversely affect seals.
DESCRIPTION
Longitudinally Mounted, Fully Adaptive, Electronically Controlled, Four Speed Automatic. Electronically Modulated Torque Converter. Separate Sump Differential. Uses an air to oil heat exchanger for cooling. Lubrication is provided by an internal-external gear type pump.