4.0L Interchangeability Question

[BlackYJ]

So would there be any issues in swapping a 4.0L from a 90 XJ to replace the 4.0L in my 95 YJ, both are mated to a 5 speed transmission.  The engine from the XJ is a reman and is in much better condition

[JackstandJohnny]

90 4l is renix. Wont work Scott. Rule of thumb. You can go from an obdII motor to an obdI but not vice versa.

[apeman]

Yup. About the only thing you can swap is the block, the head will have to be swapped for a non remix head. A lot of work,why not buy a newer style 4.0,say 97-99?

[SwampSinger]

http://forum.calgaryjeep.com/index.php?topic=26010.0

[BlackYJ]

Damn, that sucks.  It is a great engine

I can't just bolt up the intake and exhaust manifolds or does the OBDI have more sensors or something that makes it not possible?

[apeman]

Remix has a different head design, and the throttle body is different.