Cheech Posted January 31, 2012 Share Posted January 31, 2012 So I'm getting kinda tired of the three speed auto in my MJ. Without the extra gear it revs like crazy on the highway. Also the previous owner removed the kickdown or throttle valve linkage to the trans so it up shifts far too early and really bogs down. It also will not downshift going up hills either. What are my options if I were to swap out this three speed or should I try to find a replacement linkage? Link to comment Share on other sites More sharing options...
Geonovast Posted January 31, 2012 Share Posted January 31, 2012 I think your easiest option would be an AX-4 or AX-5 swap, if you don't mind going to manual. Link to comment Share on other sites More sharing options...
Cheech Posted January 31, 2012 Author Share Posted January 31, 2012 Nope, I would actually prefer a manual anyways. Whats involved in swapping over other than the pedals and hydraulics and such? Any wiring? Link to comment Share on other sites More sharing options...
dasbulliwagen Posted January 31, 2012 Share Posted January 31, 2012 The auto A904 is a non electronic trans, so it would just be a matter of getting all the parts needed to bolt on. Youll need the trans, flywheel, clutch kit, clutch master and slave, trans crossmember, driveshafts, pedals and shifters to make this happen. Good luck. Link to comment Share on other sites More sharing options...
Cheech Posted January 31, 2012 Author Share Posted January 31, 2012 Okay cool! I would probably just find an entire vehicle and swap everything I need over. What model years am I confined to? And does it have to come from a 2.5? Link to comment Share on other sites More sharing options...
txjeeptx Posted January 31, 2012 Share Posted January 31, 2012 There is another manual transmission option for the AMC 2.5L - the AX-15/NV3500 5-speed from a six-cylinder Jeep XJ or YJ/TJ can be used behind the AMC 2.5L four cylinder if you locate a 1996-1998 Dodge Dakota 2.5L four cylinder bellhousing. That year-range Dakotas had an AX-15 style transmission(not sure if it was an actual AX-15 or something else, but it has the AX-15 bell-to-trans pattern) behind the four cylinder they acquired from AMC/Jeep(which is what your Jeep has). It is an external slave cylinder bellhousing, has the correct GM 60-degree V6 bolt pattern that the AMC 2.5L four has, and shares all the same clutch related parts as the Jeep, except for the clutch disk, which has to be sourced from an 80's four cylinder Camaro application to mate to the Jeep AX-15 input shaft. Its a strange conglomeration of parts, but it is feasible. The AX-15 is a much heavier-duty transmission than the AX4/AX5. Those out there with the GM 2.8L V6 can also use the '96-'98 Dakota 2.5L bellhousing to put an AX-15 behind your stock 2.8L or for 3.4L conversion/upgrades. Link to comment Share on other sites More sharing options...
mjtjnj Posted February 1, 2012 Share Posted February 1, 2012 Some of the 2.5 came with the AW-4 behind them, which is a great tranny. Those trucks had the 4.56 gearing, too. Search car-part.com I think for 87-89 2.5 Cherokees and Comanches and see what comes up. Link to comment Share on other sites More sharing options...
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