1988 YJ 2.5 to 4.2 motor swap - JeepForum.com
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post #1 of 5 Old 04-18-2021, 09:44 AM Thread Starter
FLFFjeepguy
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1988 YJ 2.5 to 4.2 motor swap

New to the Jeep world (and bought two in two months 2002 TJ /1988 YJ) what parts do you need to swap a 2.5 to a 4.2 (258) in the YJ. Keeping it stock.

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post #2 of 5 Old 04-19-2021, 07:40 AM
Waternut
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Welcome to the Jeep world but you won't like the answer. Probably better to buy your 3rd with the 4.0/4.2 and sell the 88. The engine swap will probably cost more than what you paid for the YJ. No they don't just bolt in and no it's not a quick or easy swap. There is no generic parts list. The only reason to do an engine swap is after you've done a ton of work to the Jeep already and even then the 4.2 is probably the worst candidate for an engine swap when you consider the thousands of dollars and massive amount of manhours required to do it.
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post #3 of 5 Old 04-21-2021, 07:12 AM Thread Starter
FLFFjeepguy
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thank you for the reply. I picked the 4.2 because i was the only other engine available for that year and i thought it would be a easy swap. Maybe i will just rebuild the 2.5
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post #4 of 5 Old 04-21-2021, 10:47 AM
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Quote:
Originally Posted by FLFFjeepguy View Post
thank you for the reply. I picked the 4.2 because i was the only other engine available for that year and i thought it would be a easy swap. Maybe i will just rebuild the 2.5
Yeah I understand your rationale. Many have been down that road. The closest thing those two engines have in common is that they both came in a Jeep from the factory. Nearly everything else is different. Frame mounts, transmission, transfer case, driveshafts, shifters, exhaust, etc.


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post #5 of 5 Old 04-21-2021, 02:56 PM
cobra30689
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I guess you *could* if you were getting the complete 4.2 drivetrain along with it. But as Waternut said......you'd have to cut off and re-weld in the proper mounts for the 4.2. At that point.....you might as well go with a V8.
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