Engine Conversion

[bobtheknob]

hey i have a couple questions about upgrading my engine i have a 99 tj with a inline 4 2.5 lt.
i was first wondring what would be a good upgrade since im doing it should i jsut go big or go home?
second was thinking of just putting the inline six 4.0 lt in will it be a good swap and is it a direct bolt it?
finally money isnt a huge deal but still interested in extra costs i will run into with whatever upgrade.

Thanks

[hps4evr]

from what ive seen in a few magazines the 4.0L does not bolt into the 4 cyl. space. new mounts and such will need to be made. so, it may be easier to find a 4.0L TJ or if the swap is what you want then maybe look at the costs of a V8. preferably a full drivetrain swap from a truck of other suv. it may come down to whos doing the swap, if you're paying soemone then it wont be cheap anyway you do it.

[Zombie]

I believe jpthing has done this swap in a tj, so he may have some ideas for you

[hps4evr]

I believe jpthing has done this swap in a tj, so he may have some ideas for you

you're kidding right? you need more then belt dressing to swap an engine...

[Zombie]

He may have some good tips

you could take what you want from it but it could help

I usually ask for help from others and combine what I hear and do what I want my way
even mistakes made will give things not to do

[BlackYJ]

I did the swap in my YJ it is not a direct bolt in.  As Eric mentioned you need to cut off the frame side motor mounts and weld new ones in.  Plus you need to figure out the underhood electrical.  I used a XJ as a donor and the bulkhead connectors were different between my YJ and the XJ so it was easier to wire in the extra cylinders.  Finally, you need to modify your driveshafts.