Pretty sure my 4.2L is fudged - Jeep Wrangler Forum

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Old 09-27-2009, 03:07 PM   #1
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Pretty sure my 4.2L is fudged

I've got good reason to believe my 4.2L is fudged.


at the very least, I'm sure there are quite a few problems with it (the ring on the positive cable that wraps onto the battery terminal is rusted and broke in half for starters), I think my start motor is either crap or the block is seized... just a myriad of problems.


As far as I can tell though, the transmission is good. I can't really ifnd out because the YJ isn't driveable. I saved this one from the junkyard by a few hours and quite frankly it deserved nothing more THAN to be junked..

but I couldn't let it go. I paid 200$ for it and trailered it to its new home at my university house's garage where it sits.

It sat for 5 years... to give a bit of background as to how much anything and everything can be wrong with it.

I'd like to swap in a 360 Magnum V8 into it.

People have done 350 Chevys... well I'm a mopar guy. I can't do a chevy in a Jeep. If a 350 can fit... so can a 360... right?

That and I have a 360 in the Durango so it makes sense for me to stick to an engine I am mildly familiar with.

Has anyone done a magnum v8 swap? I know there are a TON of electronics... so I'd debate finding an LA360 instead.

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Old 09-27-2009, 03:55 PM   #2
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find a magnum v8 at a junk yard pull the all the harnessess and any wires. try and get the tranny and transfercase too. set the motor in after it is cleaned up and modified the way you want, it drop it in and set the motor as far back as possible, this is where you build your motor mount. this is the beginining.

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Old 09-27-2009, 08:17 PM   #3
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I've read elsewhere that if you can find a Dakota V6 with a manual trans, the bell house will mate a small block V8 to an AX/15.

Also I'd try pulling the starter and prying the 4.2L's flywheel teeth with the trans in neutral, the ignition off & the wheels well chocked. If it moves, take the starter to a big box parts store for free testing.

An engine swap is a lot to go through if you didn't need it in the first place. A battery terminal is also easily replaced.
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