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Old 02-16-2012, 07:59 AM   #1
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V8 engine swap

I have been thinking of swapping my 2.5 L four banger with a 5.2L magnum
Engine, I can get the engine for 300 so that my cheepest option as of right now ,, im just looking for some help with some questions that I have . Would I new to get a new transmission , would I need to get new axles or could I just regear my Dana 30 and 35 axles , what other modifications would I have to do? Any suggestions for other engines around this price range ? Any help /advice is greatly appreciated
Grayson Carter
Memphis ,TN
1994 YJ|2.5L 4-banger|4 inch lift|33 in Baja Claws
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Old 02-16-2012, 08:13 AM   #2
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I don't see any reason that you have to replace the axles that you have, but I would personaly bump them up to a D44 or D60. With regards to the tranny, since you already have the motor out, if I were you I would upgrade the tranny and play with the axles at another time. You can get a much better tranny that will without question bolt up to the new motor and one that will also bolt up to your existing T/C. This way you do not have to replace the front axle and the drive shafts should also go right back on with no trouble.

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Old 02-16-2012, 08:56 AM   #3

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If you want to do this "on the cheap" buy a vehicle that has the drivetrain you want. If you want the Magnum motor, find a Chrysler 4WD vehicle that has been rolled or something. Take out the entire drivetrain and replace. That would be a cheap way of doing it. Another way would be to find someone who has done this swap before and go "junkyard searching" for all of the parts and hope they work when you put them on. Going "cheap" for an engine swap really doesn't get cheap. It can be "cheaper" than buying everything new, but it still isn't cheap.

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Old 02-16-2012, 09:14 AM   #4
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I agree. I picked up a D60 and Ford 10.25 out of an "87" F350 that were in great shape, but by the time I was done replacing bearings, seals, gaskets and all brake parts plus the $200 cost for the axles, I was in them for $1,000.00 each. That was with all my own labor. Again if you want to go as inexpensive as possible and your axles are in good shape, just upgrade the tranny. Easy and smart upgrade since it will be all apart. Good Luck.
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Old 02-16-2012, 02:18 PM   #5
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Am in the process of swaping my 2.5 to a chevy 5.7. Ur transmission will not handle the power from the V8. And if u have a ax5 tranny I would say ditch it anyways. They r a piece of crap! Hopefully I will be done with my engine swap by next week. I cant wait either! I was lucky enough to get my engine, tranny, transfer case, and all the wiring still all attached when I got mine.
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Old 02-16-2012, 02:41 PM   #6
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You need to upgrade your rear. it will not hold the power and it will just rip itself apart. it is not a strong rear. you need a D44 at the least. a D60 would be better. even better then that would be an 8.8 but if you were going to swap one of those you'd be looking at another 600 for an 8.8 swap. the tranny needs to be upgraded. there is no cheap way of swapping to a v8, you need the drivetrain out of another junkyard truck pretty much.

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