Aisin AW4 Transmission Specifications


Chrysler-owned 1987 to 2001 Jeep Cherokee and Comanche vehicles used the Aisin-Warner AW4 four-speed automatic transmission. American Motors Corporation also equipped its vehicles with the AW4 when it owned Jeep before 1987.


  • The AW4 was used as predominately light-duty transmission for four- and six-cylinder engines with a displacement of less than 4 liters. It had a reputation for generating heat and sapping the power of the engines. Its shifting was not always smooth. However, well-maintained AW4s with an aftermarket cooler performed well.


  • The AW4 electronically controlled automatic featured an output shaft with 21 splines, with an upgrade to 23 splines in 1991. Its length was 25-3/8 inches with a bellhousing port to access a crank position sensor. Its gear ratios were 2.80-to-1 for first, 1.53-to-1 for second, a 1.00-to-1 direct third and 0.75-to-1 for fourth gear.


  • The AW4 automatic transmission was adaptable to the New Venture NP231 (New Process) and NP242 transfer cases, and Jeeps Dana 300 transfer case. The transmission also was compatible with Jeeps equipped with 4.56 rear axle ratio.

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