94 Cherokee 4.0 in an 01 TJ - JeepForum.com
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post #1 of 9 Old 03-30-2020, 05:00 PM Thread Starter
Muddblood
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94 Cherokee 4.0 in an 01 TJ

Will a 4.0L engine from a 94 Cherokee work in an 01 4.0L Wrangler? I keep hearing that the blocks are different.

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post #2 of 9 Old 03-30-2020, 05:05 PM
CJ7-Tim
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You are hearing correctly.


XJ Cherokee and ZJ Grand Cherokee 4.0L engine blocks interchange. (1991 to 1995 YJ and 1997-1999 4.0L TJ Wrangler blocks will also interchange in XJ/ZJ and visa-versa).

2000+ TJ Wrangler and WJ Grand Cherokee 4.0L engine blocks interchange.

XJ/ZJ blocks do not interchange with 2000+ TJ Wrangler or any WJ Grand Cherokee blocks without significant modifications.

TJ Wrangler and WJ Grand Cherokee 4.0L Engine block castings underwent major physical design changes effective in the 1999 WJ Grand Cherokee, and 2000 TJ Wrangler. These “S” VIN code engine blocks from a 1999-04 WJ Grand Cherokee and 2000-06 TJ Wrangler are not bolt on interchangeable with any XJ Cherokee or ZJ Grand Cherokee engine block (nor with any 1997-99 TJ engine block).

The reason why these blocks do not interchange is that the casting design changes relocated numerous bolt holes, altered the physical location of all the fan belt driven accessories, and in some areas eliminated the metal that could be drilled and tapped for the earlier configuration of motor mount bolt holes and fan belt driven accessory mounting bracket bolt holes.
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post #3 of 9 Old 03-30-2020, 05:55 PM Thread Starter
Muddblood
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Thank you! What if the 94 motor had all the accessories, mounts, belt and everything? Would the wiring harness, a/c lines, work? Can either 94 or 01 motor mounts work? My buddy was given the 94 for his 01 TJ and we’re trying to see if it’s at all possible to use. I believe the 94 is 100%. complete.
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post #4 of 9 Old 03-30-2020, 08:27 PM
jeepguy03
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Quote:
Originally Posted by Muddblood View Post
Thank you! What if the 94 motor had all the accessories, mounts, belt and everything? Would the wiring harness, a/c lines, work? Can either 94 or 01 motor mounts work? My buddy was given the 94 for his 01 TJ and we’re trying to see if it’s at all possible to use. I believe the 94 is 100%. complete.
It won't work. The motor mounts and accessories are physically different. If you google some under hood pics of Pre-2000 TJ 4.0s and 2000+ TJ 4.0s you could better see what the differences are.

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post #5 of 9 Old 03-31-2020, 08:47 AM Thread Starter
Muddblood
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Shoot. Ok thanks.
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post #6 of 9 Old 03-31-2020, 12:42 PM
Tarneg
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okay i have done motor swaps in all kinds of weird things and imma stab at this cause it may be useabl but its alot of work. if it is basically complete as you say then that solves the accessory system issues and the best bet to get it mounted is most likely to build new mounts in the 2001 frame to match the older engine mounts (usually requires cutting the stock frame mounts off) not the hardest since the engine is still a 4.0. i did a quick google for the older under hood and if im right the a/c swaps sides so those will need custom lines. also the wiring will be a nightmare alot of splicing and plug adapting, you may get lucky if its like a chevy and the sensors are the same just different plug ends cause then you can just swap the sensors in the block. you will also most likely need the engine computer and related management processors and sending units as at minumum the older engine should be the cap and rotor style and 2001 is the coil pack set up. again though depending on they they fit and sizing you may be able to take the 2001 ignition parts and fit them into the older block. i have no idea and best way to check is just try and see what happens. you will also need to make sure the back side of the block is the same to fit the tranny ( diameters sizes depths all kinds of little things). i have not done much frankensteining with jeep motors but i have mixed and matched parts on my chevy engine people said could not be done and they parts all bolted together so there is a chance,

but to put it shortly the hook up of the wiring and accessories is going to be the hard part and will likely take alot of effort to splice it in.

now if someone has actually tried this before and found a 100% issue that can not be worked around chime in.
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post #7 of 9 Old 03-31-2020, 01:54 PM
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with a certain level of mechanical knowledge, a bit of hardheadedness and a large stack of folding green...…..anything is possible

Me, Banditt, Tippie and ole Heep a long!
RIP Banditt 3/86 - 11/01
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post #8 of 9 Old 03-31-2020, 02:31 PM
CJ7-Tim
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Sell what you have, and buy what you need. 4.0L WJ's are as common as dirt.

Yes, the proposed swap is possible, and similar swaps have been done, but only with a great deal of extra effort and some added expenses. Sometime free stuff is only worth what you paid for it.

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“When the people find that they can vote themselves money, that will herald the end of the Republic.”

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post #9 of 9 Old 04-01-2020, 09:02 AM Thread Starter
Muddblood
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I like CJ7-Tim’s idea. Thank you to all who responded.
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