AMC and Jeep transmissions

American Motors Corporation (AMC) and Jeep used a variety of transmissions and transfer cases systems. This article covers all AMC (1954+) and Jeep (1946+) variants thru 1988, as well as legacy designs retained by Chrysler (and several other manufacturers) in later years. This includes:

* Jeep Cherokee XJ (1987-2001)
* Jeep CJ
* Jeep Wrangler YJ and TJ (1987-2006)
* Jeep Grand Cherokee ZJ and WJ (1993-2004)
* Jeep Wagoneer / Grand Wagoneer
* AMC Eagle (Not the Chrysler Eagle)
* AMC Concord
* AMC Spirit

While AMC had used Chrysler transmissions prior to the buyout, it had never used Chrysler engines. They have, at various times used BOP (Buick, Oldsmobile, Pontiac - GM's "independent" divisions until the 1970s) designed engines. By the end, in 1988, AMC was using only AMC Engines in their vehicles.

Early Jeep transmissions

Manual

Borg-Warner T84 was used in the military MB & GPW Jeeps.

Borg-Warner T90 Transmission used in Jeeps from 1946 through 1971

Automatic

Early AMC transmissions

Manual

Automatic

Late model transmissions

Transmissions on late model AMC vehicles came with either a 21 spline or 23 spline output shaft.

Transmissions coupled to four-cylinder engines normally use 21 spline output shafts. The 23 spline manual transmission was universal in the Eagle lines and also used later six-cylinder applications.

All Torque-Command automatics used 23 spline output shafts. Early AW4s used 21 and 23 splines.

All transfer cases at the time were available with inputs matching both. As it is far easier to change an input shaft in the transfer case than the output shaft of the transmission, transmission swaps are possible and rather straightforward between the various models and years.

Manual

*Aisin AX-4 four-speed
*Aisin AX-5 five-speed
*Aisin AX-15 five-speed
*Borg-Warner T-96 three-speed
*Borg-Warner T-85 three-speed
*Borg-Warner T-10 four-speed
*Borg-Warner T-14 three-speed
*Borg-Warner HR-1 four-speed synchronized unit used with the 121-4.
*Borg-Warner SR-4 four-speed synchronized unit used with the AMC 6 cylinder.
*Borg-Warner T-4 and T-5 four and five speed units used from 1982 onwards.
*Tremec T176 four-speed used with the AMC 6 cylinder and 304 V8 engines.
*Tremec 150T three-speed

Automatic

In 1970, AMC standardized on a variation of the Chrysler developed TorqueFlite transmission they called the Torque-Command.

These transmissions were available in both the Chevy V6 pattern and the AMC late model pattern used on their I6 and V8 engines. The Chevy V6 pattern was used on the AMC 150 I4 and the Iron Duke I4 engines.

The AW4

The AW4 four speed automatic transmission was selected by AMC for use in the Cherokee (XJ) new inline six-cylinder 4.0 L design. It was manufactured by Aisin-Warner, a member of the Toyota group, in partnership with Borg Warner. It shares many parts with its sister Toyota transmission the Aisin 450-43LE, that is incidentally used in Toyota off-road vehicles.

Gear Ratios for the AW4:
* 1st: 2.80
* 2nd: 1.53
* 3rd: 1.00
* 4th: .75

The AW4 is also used behind the 2.5 L (150 in³) AMC Straight-4 engine. It has a removable bell housing with a cutout for the crank position sensor. The earlier Jeep AW4 has a 21 spline output shaft. In the 1991 the AW4 was changed to a 23 spline output shaft. (Concurrent with the H.O. engine.)

The AW4 used its own control computer from 1987-1996.

* 1987-1990 Jeep Cherokee (XJ)
* 1991-1993.5 Jeep Cherokee (XJ) 4.0 L
* 1987-1990 Jeep Comanche 2.5 L
* 1987-1992 Jeep Comanche 4.0 L
* 1993-1993.5 Jeep Grand Cherokee 4.0 L

A604 derived/Ultradrive

Four gears, torque rating of 2, Rear wheel drive, Limited Electronics.42RLE
* 1st: 2.80
* 2nd: 1.55
* 3rd: 1.00
* 4th: .69

* 2003-2006 Jeep Wrangler, optional, all models

Jeep and Eagle transfer cases

The transfer case is an auxiliary transmission that connects the front and rear axles. It also commonly provides a selectable secondary gear reduction.

The AMC Eagle used three New Process transfer cases, models 119, 129, and 128.

Jeep Transfer Cases ("see below for New Process transfer cases)"

Applications

See List of AMC Transmission Applications

ee also

*Jeep four wheel drive systems

Companies
*American Motors
*Jeep
*Willys-Overland
*Kaiser Motors
*AM General

Parts

*New Venture Gear
*Transfer case
*Transmission
*TorqueFlite

External links

* [http://www.drivetrain.com/transfercasevehcrossref.html Application Listing]
* [http://www.chrysler.com Chrysler Corporation]
* [http://www.wagoneers.com/FSJ/tech/TransferCase/transfer-case-discussion.html Decoding]