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Unread 07-14-2013, 04:03 PM   #1
mjdh_80
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1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Wyoming, MI
Posts: 93
new engine?

Hey guys,
My 4.0 has been getting pretty tired. I found a nice 4.0 xj at a, you pull, yard around here. Don't know how many miles it has since it has a digital odo but everything is beyond clean. Doesn't seem to have any leaks from anything under the hood or drivetrain. No rust anywhere on the jeep. It was rolled so thats why it was scrapped.
I have a 98 TJ 4.0 5 speed. The donor vehicle is a 96 XJ 4.0 auto.
Does anyone know if there would be any problems swapping the engine out?

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98 TJ, 4.0l, 2"Budget Boost, 31" Mud Country's, soft top
06 WK, 4.7l, Stock for now
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Unread 07-14-2013, 08:28 PM   #2
cruiser54
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 9,800
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 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)
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
Refresh*Connections*Before*Replacing*Components
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Unread 07-14-2013, 08:53 PM   #3
mjdh_80
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1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Wyoming, MI
Posts: 93
Whew thats a lot of great information. Thank you!
I'm pretty sure I'm reading it right in that my 98 TJ is interchangable with all XJs. Again thank you very much!
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98 TJ, 4.0l, 2"Budget Boost, 31" Mud Country's, soft top
06 WK, 4.7l, Stock for now
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Unread 08-15-2013, 05:12 PM   #4
mjdh_80
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1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Wyoming, MI
Posts: 93
Ok I have another question. Since my engine is getting tired I might look into replacing the whole dtivetrain. My tj is currently a 5sp but my wife doesn't know how to drive a manual. What is the best engine/transmission/transfercase I can drop in it?

This will still be my D.D. So nothing crazy.

I was thinking to stay with a 4.0 still but grab a whole drivetrain out of a wrecked jeep with an auto and I'm sure I would have to get the ecu also and didn't know if I would need a different transfercase too. I am wondering what years are best. I am however also open to suggestions of other manufacturers. But I don't have resources to do the axles yet.
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98 TJ, 4.0l, 2"Budget Boost, 31" Mud Country's, soft top
06 WK, 4.7l, Stock for now
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Unread 08-15-2013, 05:21 PM   #5
Tailwheel42
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2005 TJ Wrangler 
 
Join Date: Mar 2013
Location: Atlanta, GA
Posts: 21
As far as the transmission: 3-speed TorqueFlite 32RH automatic. Yes, it does NOT have overdrive, but I'd take one any day over my 42RLE auto. If I could do it over I would of purchased an older TJ with the 32RH and saved a lot of money!
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Unread 08-16-2013, 12:08 AM   #6
Idahotrout
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Sounds interesting, good luck
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Unread 08-29-2013, 01:27 PM   #7
mjdh_80
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1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Wyoming, MI
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Ok so my cousin is thinking about putting a 5.3 sbc in his little nissan. I know a lot of guys have put 350's in wranglers. But I'm wondering if I could grab a 5.3, all the wiring, and trans out of a wrecked truck and drop it in the tj? Really have no idea whats involved in "repowering". I've completely rebuilt engines before nut never put an engine from a different vehicle in something.
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98 TJ, 4.0l, 2"Budget Boost, 31" Mud Country's, soft top
06 WK, 4.7l, Stock for now
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Unread 08-29-2013, 09:22 PM   #8
uberxj92
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1992 XJ Cherokee 
 
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There's Fab work for motor Tranny mounts. Wiring, several hours there. Linkage fabrication. Customizing drive shafts.
It's fun. I have put couple of diesels in xjs and mjs. Even put a LT1 in an xj. That sucked. Lol the guy drove it into a tree.
Anything can be done with the correct amount of blood sweat tears and cash.
IMO I would stroke a 4.0 and put her in there. I have 2 & am never looking back
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