AMC and Jeep Transmissions - Transfer Cases

Transfer Cases

It has been suggested that this article or section be merged with Jeep four-wheel-drive systems. (Discuss)

The transfer case is an auxiliary transmission that connects the front and rear axles. It also commonly provides a selectable secondary gear reduction. AMC and Jeep vehicles have used several different transfer cases in their various models.

Summary of AMC/Jeep Transfer Cases
Case Offset Spline Ratio Bolt Pattern Years Used
Borg-Warner 13-39 Both Right 10 2.57:1 THM400 1973–1979
Dana 18 Both Right 6 (10) 1.98:1, 2.42:1, 2.46:1 Texas 1940–1971
Dana 20 Front Right 6 (10) 2.03:1 Texas 1963–1979
Dana 300 Front Right 23 2.62:1 Round
(New Process)
1980–1986
Atlas 2 Speed Front Right or Left Variable 2.0:1, 3.0:1, 3.8:1, 4.3:1, 5.0:1 Round
(New Process
Aftermarket Replacement
Atlas 4 Speed Front Right or Left Variable 5.44:1, 8.16:1, 10.34:1, 11.70:1 Round
(New Process
Aftermarket Replacement
See below for further information on New Process/New Venture transfer cases.

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