There were a numerous updates and changes to the AW-4 and to the engine computers that operate it, over the life span of the Cherokee/Comanche. Some of the changes can be dealt with for transmission swaps, and some cannot, depending on the exact transmission and vehicle in question.
1990.5 to 1996, the AW-4 will interchange with no problems. The 97 NP 231 should fit and function, but you will have no speedometer due to the difference in speedometer output, mechanical vs. electronic. You may have Computer and/or shifting issues due to no speedometer output to the computer. The best solution would be to install the SYE on a 231 compatible with the 1991 engine and transmission controls/computers.
Total US debt has increased by 70% under Obama, from $10.625 trillion on January 21, 2009 to $18.005 trillion January 1, 2015.
Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ......
Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.