87mj99wj Posted May 21, 2015 Share Posted May 21, 2015 Hey guys I'm new, I just picked up a 87 sport truck 2wd with the 4 speed and 2.5. The trans is blown and I want to swap in the driveline from a 01 xj with the 4.0,aw4, 231case and the d30 hP. Would it be easier to just update the interior and swap everything from the xj? Also What else would I need? Link to comment Share on other sites More sharing options...
Fernando87mj Posted May 22, 2015 Share Posted May 22, 2015 Careful with the 2001 engine , the 2000-2001 4.0s have a problem with the head cracking between cyl 3 and 4 I think . Link to comment Share on other sites More sharing options...
Megadan Posted May 22, 2015 Share Posted May 22, 2015 Get a good aftermarket replacement head when/if it cracks. Not a biggie. I would definitely do a little research on a full conversion like that. I know you have to fill holes and make new holes in the fire wall to do the complete conversion like you are describing. Link to comment Share on other sites More sharing options...
87mj99wj Posted May 22, 2015 Author Share Posted May 22, 2015 Problem is I can't find anything on a full conversion, I did a lot of looking before I posted. That's Why I'm coming to you guys for advice. I will be taking a lot of pics along the way of stripping the xj so I know where everything goes on the mj. Link to comment Share on other sites More sharing options...
dunnc1991 Posted May 22, 2015 Share Posted May 22, 2015 first page of the project forum... http://comancheclub.com/topic/32740-alexias-1987-to-1997-comanche/page-27?do=findComment&comment=480339 http://comancheclub.com/topic/19297-1990-rebirth-97-conversion/page-36?do=findComment&comment=472480 Link to comment Share on other sites More sharing options...
dunnc1991 Posted May 22, 2015 Share Posted May 22, 2015 Also, unless it's been swapped in, that d30 in the XJ is a low pinion axle. Link to comment Share on other sites More sharing options...
mvusse Posted May 22, 2015 Share Posted May 22, 2015 You will need to swap EVERYTHING. Dash harness, engine bay harness, radiator mount, The transmission tunnel should have 4 dimples you may need to drill out to mount a transfer case linkage bracket, but it is also possible they have been drilled at the factory and just have rubber plugs in them. You will also need to splice the MJ body harness into the XJ dash harness. The tail lights are wired differently, but there should be instructions somewhere on this site. You will also need the XJ sender assembly, which contains the pump, correct fuel level sender for the dash cluster, and the fuel pressure regulator. But since it is mirror image from the MJ one, it will only fit in the 84-86 carburated V6 tank. The baffles inside the fuel injected tanks will be in the way for the pick-up. There is no other solution for this. 91 and 92 MJ sending units do have the correct sender, but will lack the fuel pressure regulator. Link to comment Share on other sites More sharing options...
87mj99wj Posted May 22, 2015 Author Share Posted May 22, 2015 mvusse, I'm confused about the fuel set up. Link to comment Share on other sites More sharing options...
Megadan Posted May 22, 2015 Share Posted May 22, 2015 mvusse, I'm confused about the fuel set up. It's a returnless fuel system, which means there is no fuel return from the regulator in the engine bay like there is on your truck from the factory. The returnless systems regulate the pressure from inside the tank as part of the hanger assembly. Link to comment Share on other sites More sharing options...
shelbyluvv Posted May 22, 2015 Share Posted May 22, 2015 Dakota tank and sender is the new swap tank. Link to comment Share on other sites More sharing options...
mvusse Posted May 23, 2015 Share Posted May 23, 2015 How much is involved in fitting a Dakota tank under an MJ? Link to comment Share on other sites More sharing options...
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