freakjeep93 Posted October 25, 2009 Share Posted October 25, 2009 the 1.5 4cylyniders aer damn near indestructable and very torqey also they are light. with a 2.5 in my old comanche it could go places where my cousins 4wd checy had probles and my gramps 4.0 comanche got stuck just because the front was lighter. and most 2.5s are standard for better gearing. edit my comanche was 2wd too so was gramps Link to comment Share on other sites More sharing options...
Geonovast Posted October 25, 2009 Share Posted October 25, 2009 If it's the 4 cylinder then, and a manual, it will either have the AX-5 5 speed or AX-4 4 speed. You cannot tell the difference between these just by looking, as the AX-4 is identical to the AX-5, except the 5th gear is missing. The AX-4/5 CANNOT go behind a 4.0 6 cylinder. Link to comment Share on other sites More sharing options...
Gig Pig Posted October 25, 2009 Author Share Posted October 25, 2009 The AX-4/5 CANNOT go behind a 4.0 6 cylinder. Thanks. My thoughts are I will run the 4 cyl. till I find a donor with an AX-15 & just swap it all. This will work correct? XJ donors are very abundent in my area Link to comment Share on other sites More sharing options...
Gig Pig Posted October 29, 2009 Author Share Posted October 29, 2009 Of course monday when I got a hold of the guy with the 4cyl. truck, he decided he didn't want to sell it. :nuts: It had been on craigs list for at least 3 weeks. I seem to have a knack at finding cars for sale that the people change there mind on. Anyways, if someone could answer me this???? I've read that the 4 cyl. comanches have a shorter firewall, thus not allowing a 4.0 swap. Is this correct? Link to comment Share on other sites More sharing options...
Geonovast Posted October 29, 2009 Share Posted October 29, 2009 No. Firewall between 4 cylinder and 6 cylinder is the same. What you've read is about the differences in the firewall in 84-86 XJs and 86 MJs. The 4.0 wasn't introduced until 87, and the 6 popper they used in 84-86 XJs and 86 MJs was a shotty 2.8L V6. The only firewall issue is dumping a 4.0 into an 86, which can be done, you just have to spend a few minutes with the firewall and a BFH. Link to comment Share on other sites More sharing options...
Gig Pig Posted October 29, 2009 Author Share Posted October 29, 2009 No. Firewall between 4 cylinder and 6 cylinder is the same. What you've read is about the differences in the firewall in 84-86 XJs and 86 MJs. The 4.0 wasn't introduced until 87, and the 6 popper they used in 84-86 XJs and 86 MJs was a shotty 2.8L V6. The only firewall issue is dumping a 4.0 into an 86, which can be done, you just have to spend a few minutes with the firewall and a BFH. Thanks for clearing up my mix-up. This will be good info for later as well. Thanks Link to comment Share on other sites More sharing options...
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