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Old 10-22-2009, 06:53 PM   #1
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How hard to change '90, 4 Cyl. to 6 Cyl. ?

I have aquired a 1990 Wrangler, 4 Cyl., in fair condition with 124,000 miles.
I may need a motor. What is best option ? Replace 4 Cyl. ?
Replace with 6 Cyl.? Has 5 speed transmission.
Will drive train handle 6 Cyl. ?
Thanks

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Old 07-29-2010, 06:36 AM   #2
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Quote:
Originally Posted by jmoran
I have aquired a 1990 Wrangler, 4 Cyl., in fair condition with 124,000 miles.
I may need a motor. What is best option ? Replace 4 Cyl. ?
Replace with 6 Cyl.? Has 5 speed transmission.
Will drive train handle 6 Cyl. ?
Thanks
Simple Answer, no trans won't bolt up and transfer case may modification to input shaft. And trans is weak. It is basicly a car trans in a truck.

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Old 08-11-2010, 09:59 PM   #3
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Same cost as doing a V8 swap less the axle mods that may be required with the V8, I have a brand new jasper 6 cylinder for you though 3 year 100,000 mile warranty in Texas, will sell for 2000.00
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Old 08-18-2010, 11:45 AM   #4
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I would find a donor 94-96 4x4 cherokee with the 4.0l 6 cyl. swap wiring harness along with the drivetrain. This way you have everything you need to have the upgraded engine and the external slave cylinder. Most times you can find them for less than 800 bones. The axles will handle just fine until you decide to upgrade them as needed. If anything the rear drive shaft will need to be replaced with a shorter one. The cherokee front ds should be the rite length just have it balanced and replace the ujoints..
My .002 cents
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Old 08-18-2010, 01:31 PM   #5
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one thing that screws alot of people up is that the frame mounts for the engine are different...your gonna have to cut them off and reweld them forward for that swap
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Old 08-19-2010, 04:55 PM   #6
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Originally Posted by Ibuildembig View Post
one thing that screws alot of people up is that the frame mounts for the engine are different...your gonna have to cut them off and reweld them forward for that swap
You think that's bad... Try a '71 DJ-5... someone swapped the I4 for a I-6 232 from '78 or '79... Mounts are not only in the wrong place but totally different, someone cut the mounts off the frame of the donor (whatever it was) and then cut the mounts off right below the engine (cut off the bushings and all... straight metal!) and welded the engine to the frame!

I had to create my own mounts from scratch... nobody does DJ parts...
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Old 08-19-2010, 04:59 PM   #7
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Someone else always has a good idea dont they? lol

I make all my own engine mounts and cradles anymore, least I know they will fit and I'm not paying big bucks
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Old 09-04-2010, 12:55 AM   #8
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Originally Posted by Ibuildembig
Someone else always has a good idea dont they? lol

I make all my own engine mounts and cradles anymore, least I know they will fit and I'm not paying big bucks
Would I need to change the diff and axles if I added a six cylinder with the matching transfer case?
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Old 09-04-2010, 10:56 AM   #9
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No your better off staying with what you have as they are prolly 4.10's
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Old 09-05-2010, 01:37 PM   #10
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I did the Cherokee swap in my old 89 yj was kinda a pain but it worked if you're lookin fror something easy that's def not the way. I'd suggest the v8 swap that way your goin through the work already might as well go big or go home.
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Old 09-20-2010, 01:27 AM   #11
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I have the V8 swap, 350 with TBI and wouldn't go any other way. For the monies you'll invest, you should look at teh swap. I have the 350 tbi with an SM465/ Hydro clutch, Dana300 twin stick with 4:1, 4:88 in a 44 up front and the same in a 60 in the rear. You'll really enjoy the v8.

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