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Discussion Starter #1 (Edited)
This would make a good FAQ, but it looks like I can't create a thread in there. So, I will create the thread here.



1 - Differential
2 - Transfer Shaft
3 - Transfer Gear
4 - Front Plantetary Carrier
5 - Rear Planetary Carrier
6 - Output Shaft
7 - Output Gear
8 - Output Speed Sensor
9 - Low/Reverse Clutch
10 - 2/4 Clutch
11 - Reverse Clutch
12 - Overdrive Clutch
13 - Underdrive Clutch
14 - Input Speed Sensor
15 - Convertor Clutch
16 - Oil Pump
17 - Input Shaft
18 - Torque Converter
 

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Some added goodies:

The 42LE (42LE Transaxle) is a four-speed transaxle that is a conventional hydraulic/mechanical assembly with an integral differential, and is controlled with adaptive electronic controls and monitors. The hydraulic system of the transaxle consists of the transaxle fluid, fluid passages, hydraulic valves, and various line pressure control components. An input clutch assembly which houses the underdrive, overdrive, and reverse clutches is used. It also utilizes separate holding clutches: 2nd/4th gear and Low/Reverse. The primary mechanical components of the transaxle consist of the following:

Three multiple disc input clutches
Two multiple disc holding clutches
Four hydraulic accumulators
Two planetary gear sets
Hydraulic oil pump
Valve body
Solenoid/Pressure switch assembly
Integral differential assembly
Control of the transaxle is accomplished by fully adaptive electronics. Optimum shift scheduling is accomplished through continuous real-time sensor feedback information provided to the Powertrain Control Module (PCM).

The PCM is the heart of the electronic control system and relies on information from various direct and indirect inputs (sensors, switches, etc.) to determine driver demand and vehicle operating conditions. With this information, the PCM can calculate and perform timely and quality shifts through various output or control devices (solenoid pack, transmission control relay, etc.).

The PCM also performs certain self-diagnostic functions and provides comprehensive information (sensor data, DTC's, etc.) which is helpful in proper diagnosis and repair. This information can be viewed with the DRB scan tool.

TRANSAXLE IDENTIFICATION
The 42LE transaxle identification code is a series of digits printed on a bar-code label that is fixed to the transaxle case as shown in (Transaxle Identification Label).

For example, the identification code K 821 1125 1316 can be broken down as follows:

K = Kokomo Transmission Plant
821 = Last three digits of the transaxle part number
1125 = Build date
1316 = Build sequence number
Depending on date of manufacture, some transaxles will utilize a new identification label located in the same location as shown in (Transaxle Identification Label). This label can be broken down as follows (Identification Label Breakdown):

If the tag is not legible or missing, the “PK” number, which is stamped into the transaxle case, can be referred to for identification. This number differs slightly in that it contains the entire transaxle part number, rather than the last three digits.
 

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Transmission output is directed to an integral differential by a transfer gear system in the following input-to-output ratios:

First 2.84 : 1
Second 1.57 : 1
Third 1.00 : 1
Overdrive 0.69 : 1
Reverse 2.21 : 1
 
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