TJ BLOCK Interchange

Swaping 258 to 4.0, 4.0 parts to 258 etc!
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Cannonball
Posts: 7
Joined: April 5th, 2011, 7:25 pm
Vehicle Year: 2004
Vehicle Make: Jeep
Vehicle Model: Rubicon

TJ BLOCK Interchange

Post 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.

Cannonball
duck454ss
I think I'll order a "tab"
I think I'll order a "tab"
Posts: 43
Joined: November 25th, 2010, 8:43 am
Stroker Displacement: 4.6
Vehicle Year: 2005
Vehicle Make: Jeep
Vehicle Model: LJ

Re: TJ BLOCK Interchange

Post 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.
Injection is nice but I'd rather be blown..... 4.6L, Eaton M112, Edelbrock Head, 31cc Dish Pistons, 1.7 Harland Sharp...
1stDeuce
Posts: 1
Joined: June 8th, 2016, 12:53 pm
Stroker Displacement: 4.5
Vehicle Year: 1998
Vehicle Make: Jeep
Vehicle Model: Wrangler

Re: TJ BLOCK Interchange

Post 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...

C
2grimjim
Where's the "any" key?
Where's the "any" key?
Posts: 29
Joined: October 10th, 2022, 6:01 pm
Stroker Displacement: 4.7
Vehicle Year: 2006
Vehicle Make: Jeep
Vehicle Model: LJ

Re: TJ BLOCK Interchange

Post by 2grimjim »

1stDeuce wrote: April 25th, 2023, 8:45 am 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...
The 1999-04 TJ and WJ use the same block. The TJ/LJ continued to use this block up to 2006.

The XJ (91-01), YJ (91-95), ZJ (91-98), and TJ (97-98, there was technically was no 96 TJ) blocks interchange.

The big difference between the model/years was the accessory mounting bosses on the block.

There are subtle differences on the 96 -01 XJ, and 97-98 TJ and ZJ blocks. These changes, depending on the year, were the change to the thrust plate cam in 99 (for all block types), and the "NVH" designation with the beefed up block and the main cap girdle on all 96 and later blocks.
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