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Old 04-21-2015, 12:47 AM
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Location: JBSA-Lackland, TX
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What to change on a new YJ?

I just picked up a '94 straight 6, 5 speed, for $5500. (I'm in MS and Jeep prices here are ridiculous) But it's been my dream Jeep for a while.

Anywho, it's in great shape 3 spots on the body with a little bit of rust, but none anywhere else.

So, my question is this: not considering condition, or what the PO said they did/didn't do, what are the first things you should change/replace/fix up/etc? I don't mean mods, though. I mean things that are already on it, but should probably be replaced after 21 years.

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Old 04-21-2015, 01:55 AM   #2
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Take a look under the carpet for rust, replace hoses if old, coolant, belt, have a good look at the crossmember that the gas tanks attaches too and do a full tune up: plugs, wires, cap/rotor, differentials, transmission, transfer case, fuel filter, air filter, grease the chassis, go through the frame with a fine tooth comb and remove rust/treat.

This way you have a clean slate for the most part

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Old 04-24-2015, 08:35 PM   #3
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Filters, fluids, tune up items, belts, hoses, entire cooling system.
'91 YJ Sahara 4.0L/AX-15/NP231, D30/D35 @3.07
'12 KK Cherokee 3.7L/42RLE/MP1522,D30M/[email protected]
Emissions testing? YES
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Old 04-24-2015, 11:21 PM   #4
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Originally Posted by DREDnot View Post
Filters, fluids, tune up items, belts, hoses, entire cooling system.
Yep, check and/or change fluids.

Get the MT-90 in the tranny and buy some extra to do a few changes over some time.

Take it to coin op and degrease/clean the be-Jesus out of it so you can start monitoring leaks.

Inspect/overhaul the coolant system hoses to fan clutch - never a bad idea.

After that - drive it and be ready for project repairs/upgraded and lots of fun.

Did I mention getting the MT-90 into the tranny?
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Old 04-25-2015, 07:36 PM   #5
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When I bought my 90, only a few of the gauges worked. If yours all work, you're lucky. If they don't, spend a day removing the dash (look for the screws, it comes right off), and take the gauge cluster out. There's a flexible circuit board in back of the gauges that is simple to clean with a fine cloth and pencil eraser. Use the eraser to clean the contacts on the gauges. The oil pressure sending unit is also notorious for going bad and is a cheap fix. Do a search in this site for more detailed instructions if you need them. Good luck and welcome to the forum!
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Old 04-25-2015, 08:13 PM   #6
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Definitely get the basic maintenance stuff knocked out first. I've done the oil/filter, serpentine belt, wiper blades, replaced burnt out bulbs, and tire pressure. The air filter, front and rear diff's, tranny, and t-case are next along with new coolant hoses and a coolant flush. I'm looking into CAI's but honestly none of them are all that appealing without some kind of an air box. I won't touch a K&N with a ten foot pole and hate the one I have on my Powerstroke - the PO did one heck of a hack job putting it in there.
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Old 04-26-2015, 11:49 AM   #7
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Location: Florida Panhandle
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I'm from up around where you are! Anyways definitely check the diffs, with all the mudding and water playing up there I wouldn't be surprised to see the seals leaking. Another thing is the starter, the two YJs I got up there still had the original starter and both failed in the first month, just pull it off, inspect, and test it (one of mine looked corroded inside when I cut it open). Also the clutch slave is vulnerable and I've seen them beat up and fail mid drive. People up there ride them hard and put them up wet usually. Congrats on the find!,I paid almost what you did for my first one and it wasn't drivable and looked like it had sat in a salt bath.

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