Jeepin35 Posted April 7, 2019 Share Posted April 7, 2019 Looking for some help. Does anyone know if a 98 head from an XJ will work on the block of my 89 MJ? Was in process of doing 98 swap and found the block of the 98 is junk. Just looking for options. Thought I could swap head, distributor, intake and so on to my 89? Thanks for any help Link to comment Share on other sites More sharing options...
cruiser54 Posted April 7, 2019 Share Posted April 7, 2019 Yes, it will. XJ Cherokee and ZJ Grand Cherokee 4.0L engine blocks interchange. 2000+ TJ Wrangler and WJ Grand Cherokee 4.0L engine blocks interchange. XJ/ZJ blocks, and the 2000+ TJ/WJ blocks DO NOT interchange without significant modifications. (1991 to 1995 YJ and 1997-1999 4.0L TJ Wrangler blocks will interchange in XJ/ZJ and visa-versa). TJ/WJ 4.0L Engine blocks underwent clean sheet design changes effective in the 1999 WJ Grand and 2000 TJ Wrangler. These blocks are not interchangeable with XJ/ZJ engine blocks. The reason is motor mount bolt holes and belt driven accessory mounting bolt holes are in different locations, or not present at all, TJ/WJ vs. XJ/ZJ. XJ: "Regular" (not Grand) Cherokees 84-01 ZJ: Grand Cherokee 93-98 (Gen1) WJ: Grand Cherokee 99-04 (Gen2) YJ: Wrangler 87-95 (Gen1) TJ: Wrangler 97-06 (Gen2) Link to comment Share on other sites More sharing options...
Jeepin35 Posted April 7, 2019 Author Share Posted April 7, 2019 Cruiser54. Thank you. I seen that on another site but was just asking to double check. More work but will be worth it! Link to comment Share on other sites More sharing options...
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