Topic: Compatability of YJ and TJ 2.5L

[UNLIMITLESS]

My Dad has a 94 YJ with a 2.5/5 speed. The motor was overheated before he bought it, we replaced 2 freeze-out plugs and got it running. Now it seems the head or blocked is cracked somewhere. Loses water like crazy.

Now I have found a 98 TJ 2.5/Auto, low mileage wreck. No motor damage, nice rollover.

Now here are the Questions:
Are the long blocks the same 94-98?
Are the cranks the same Auto/Stick?
Exhaust/Intake manifolds the same?

The price is right so Im hoping they are the same. I would like to use as much of the 98 motor as possible but if I can only use the head/block Ill go that way.

Thanks in advance guys!

[Jeffy]

The core block and head are the same.  Cams are different but I think that's it for internal stuff.  Accessories like the waterpump and belt routing is also different.  Same goes for the exhaust manifold.  TJ's are routed better since the crossover pope goes forward and crosses over under the oil pan rather then over the bellhousing like on a YJ.  FI is also a bit different.  YJ's have a return line for the FI and the pressure regulator on the rail isntead of at the tank.

If you're planning on swapping the YJ parts onto the TJ core then it should be fine.  You can get into some trouble if you're looking to mix and match too much.  You could also go ODBII and use the TJ's computer...

[Bounty Hunter]

Just use the block and head, you'll be fine.