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Old 08-10-2015, 02:22 PM
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Join Date: Aug 2015
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buying 94 yj, 4.0 5spd, what to do first thing?

I'm purchasing a 1994 4.0 5spd yj. What preventative maitenence/ cheep performance things should I do to her or look for. Also I'm thinking about swapping in a v8 possibly a 351 windsor. Would that be a good/easy swap or there other motors that would be better? Thanks for your time and input!!!!

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Old 08-11-2015, 10:01 AM   #2
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I believe I'd work on changing the fluids and filters.

Illegitimi non carborundum
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Old 08-11-2015, 10:08 AM   #3
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Have not done engine swap my self, however did a research on it. The main issue with the swap, is weak YJ drive train. Basically to make it work well you'll need to also swap transmission to a more capable one, and front and rear axles to stronger ones, else with stronger engine you can destroy those 3 pieces.

As for quick cheap changes. First do all the fluids, car is old, you never know how it was maintained. Changing fluids can uncover certain problems that otherwise not seen.
By changing fluids i mean all of them, not just engine, axles, transmission and etc.

lastly, not sure if you did, but if not and you already have the jeep, check it's frame for rust/rot, it's first thing you'd want to dump money on if it's not solid.

Lastly, check break pads.
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Old 08-12-2015, 09:49 AM
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Thanks for the advise yall. Defiantly gonna put new air filter and oil filter, and change ALL the fluids. I got lucky with this one... 47000 miles on her first engine and been colorado garage kept her whole life so not a spec of rust on her, as for the drive train and axles do you guys know of any other vehicles I could get some parts off of from a junkyard? Been doing a little research and found some people saying ford explorer rear axles are a bit beefier and an easy swap.
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Old 08-14-2015, 09:39 PM   #5
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Just purchased a 94 YJ 4.0 w/ 5 speed a couple months ago. First thing I did was new wheels and tires and rebuilt the front end. I probably will upset some people but I got rid of the 31/10's and replaced them with stock wheels and 225/75 15's. Better fuel mileage and drives much better.
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Old 08-14-2015, 10:44 PM   #6
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Take er wheelin!!!
Let me tell you about Time Machine: 95 YJ Rio Grande Edition l4 2.5l on 31s stock height springs from GS, Warrior Products .5" shackle lift, Softopper tan soft top, daystar 1" body lift, Spartan locked D30, open D35 with 4.10 gearing
"Time to bust out the honky-tonk attitude"
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Old 08-15-2015, 12:27 PM   #7
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If rust isn't an issue then fluids/filters and ignition tune up (plugs/wires/cap/rotor) should go first.

Then, I'd inspect the exhaust manifold for cracks right where all the pipes come together.

Then I'd look at vacuum hoses and ccv/pcv elbows/fittings.

Once all those are good Enjoy the new ride.

And yes, look into the ford 8.8 rear end.
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Old 08-16-2015, 01:44 PM
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Brought her home yesterday and she is INCREDIBLE, practically brand new, changed all fluids, put in some engine treatment and inspected everything... no problems... feeling blessed to have found this 94 with only 47k miles. Doin great on the highway only thing left to do is take her into the woods

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