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In SD. 3.55 gears, no noises.

Is it critical to have the number stamping on the bearing facing out? I wasn't paying attention when I put them in.

1988 4.0 AT My O2 sensor seems to not be working. I backprobed it with my Fluke 115 which usually is fast enough to pick up the voltage swinging back and forth. I'm getting a steady 5v. The old O2 is an NTK which lasted about 2 years so I decided to go back to Bosch and give them another try...

1988 4.0 new rebuilt motor AT Under light throttle, I can hear a hiss coming from the area around the fuel pressure regulator. I pulled the vacuum line to the FPR and listened and its there without vacuum. Is this normal? I wonder if I need a new FPR.

1988 4.0 AT, 500 miles on rebuilt engine This is a long one. In an effort to squeeze as many mpgs out of the fresh rebuild, I've been trying to figure out why my vacuum is low at idle. Engine runs great, idles around I'd say 850 rpm. When i started down this rabbit hole a couple of weeks...

Hey guys, Last winter I had the 4.0 from my 88 rebuilt by a recommended machine shop. At the time, the rod bearings were shot and I was chasing a mystery knock. It wasn't a flexplate knock. Within a 30 minutes of run time I could hear that the rebuilt engine had a knock. Actually, I think it's...

Out of an 88. Free!

I'm helping my friend sell his 87 XJ. Asking $2,000. The good: Laredo package with Dana 44 rear, factory skids, and tire carrier. Looks like a slight lift on it. No major modifications. The bad: 300k, door hinges are in bad shape, it was stolen and recovered so ignition switch is messed up and...

88 4.0 AT 206,000 miles https://www.youtube.com/watch?v=H_Tgptlh64g Through a stethoscope, I can hear it loudest on the oil pan below the main seal. All the flexplate bolts are tight, and I can't see any cracks in it. Thoughts?

I have a set of new in the box JKS shock adapters, part # 9605. $40

I have a 21 spline NP 242 that came out of my 88. It needs to be rebuilt, not shifting and probably a stretched chain too. Its free, but a trade for a useful part would be cool.

Hey, I've got some JCR center section frame stiffeners I need welded. I've got the frame cleaned up and ready to go, but I can't weld. Can anybody recommend a shop in San Diego? Thanks.

Any idea what the scrap value is for a factory cat? I just replaced mine with a Walker after failing smog.

1988 XJ 4.0 AW4 NP242 I'm planning on swapping out my 242 for a junkyard 231 AMC tomorrow. I'll be rebuilding the 242 hopefully over the summer. My questions is will this 231 AMC with the vacuum switch for a CAD system play nice with the full time Dana 30 on my jeep? I know this tc doesn't...

Does anyone know if it's possible to purchase Jeep replacement seals for an early 21 spline NP231? I called my local Jeep dealership, but the parts guy said they don't support this transfer case anymore. If not, what's the best brand to use? National? Timken? Crown? I'm swapping in a jy NP231...

Anyone have one collecting dust? This would be for my 88 4.0 AW4.

1988 4.0 AW4 195K So, I think I drove my about 250 miles or so with little or no oil in the transfer case which is a np242. I didn't notice it making any noise, but that was probably because I was missing a muffler at the time. I noticed the noise tooling around the neighborhood a couple of...

Hello, I have a 1988 XJ 4.0L AW4, 190k on the odometer. This was an Ohio jeep that I'm now trying to smog in CA. Here's my issue: It seems that my new EGR valve is causing the motor to stumble under light acceleration from a stop. If I don't let off the pedal or push down harder, the motor...

Hello, Does anyone know where I might be able to find a replacement EGR solenoid besides the dealer? This is for a 1988 Cherokee 4.0L automatic. I ran through the standard vacuum tests today, and it appears that I need a new EGR valve and solenoid. There is vacuum on the input side, but none...