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TJ BLOCK Interchange

Posted: January 18th, 2017, 8:13 pm
by Cannonball
Im looking to do a 4.7 stroker in my 2004 Rubicon TJ w/42RLE auto trans. I have heard many 4.0 donor blocks wont bolt up or have figment issues. What donor Engine blocks will fit and how do I tell what they are if they are out of the vehicle? Does anyone know? Casting numbers and or date codes? Where do I find them.

Thanks in advance because I have searched al over and cannot find any interchange info for the late TJ 4.o's.

Im not tearing down the old engine its only got 47 K on it and I'm saving it for my other TJ.


Re: TJ BLOCK Interchange

Posted: May 17th, 2017, 12:00 pm
by duck454ss
I'm using a 97 block in my 2005 LJ...... if you contact Brown Dog he will make you a set of motor mounts that will allow for your fit. when my engine finally goes in thats what i'll be doing.

Re: TJ BLOCK Interchange

Posted: April 25th, 2023, 8:45 am
by 1stDeuce
If you want a no-hassle bolt in block, you need one from a 2000+ TJ or a 99+ WJ. I believe a 2000+ XJ block will also work but the accy drive layout for XJ is not the same and a few people have suggested that engine block is not the same... Hopefully someone can chime in...