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how easy or hard is a 4.0 swap in to my 4cyl mj i would buy a complete xj to swap from so that would give me harness ecu....... i only wonder if there is alot of fabing like mounts or anything like that.

Thanks

Travis

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how easy or hard is a 4.0 swap in to my 4cyl mj i would buy a complete xj to swap from so that would give me harness ecu....... i only wonder if there is alot of fabing like mounts or anything like that.

Thanks

Travis

 

is your 4 cylinder an 87 and/or newer?

 

if so, everything will bolt in. mid-87+ 4 cylinders use 4.0 radiator supports with an adapter for the 4 cylinder radiator...so, if you want to do the swap, you just need the interior and engine bay wiring harness, and all engine bay accessories including frame-side motor mounts. you will also need to swap out your fuel pump (the xj one can be put on the MJ sender) and perhaps the upper fuel lines

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and for that i could also find a long bed 4x4 mj and just use that drive shaft correct? or have mine shortend since i have a 2wd

 

do you have a longbed?

 

if so, then yes just get a longbed 4wd driveshaft from a longbed which has the same motor as you are putting in.

 

also, a 2wd shortbed rear driveshaft may work in the back of a 4wd longbed...but there are many variables there...I'm using a 2wd shortbed 4.0 auto dana 44 equipped rear shaft in my lwb 2.8 4x4 5 speed which now has a dana 44...no problems as of yet.

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