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Here's a good write-up on swapping AW4s from different years: http://www.naxja.org/forum/showthread.php?t=1053970

I have a '95 YJ 4 banger and I experienced the exact same problems. Kastein's advice is on target (as usual). Check/clean the grounds and wiggle the harnesses. My problem turned out to be the wire harness connector that plugs onto the coil. I took some pliers and squeezed the 2 female...

Add motor mounts to your list of things to check.

x2 on the park pawl. The edges of the pawl can wear down over time and become rounded (not grab), springs can break or weaken. It is also possible that the shift cable is a little out of adjustment (cable stretches over time).

In general, the NP231, NV231 and 231J (J for Jeep) are all the same transfer case. There is a 231HD (heavy duty) and a 231C (Chevy) as well. There is a small round metal tag on the back of the case that has specific model and serial numbers. Now for the tricky parts - the clocking (rotation)...

Not sure what part of Cali that you drive through. Do you ever drive on snow or ice? That is an important consideration when buying tires.

Check your accelerator pedal, throttle cable, return spring and all linkage. Lubricate the cable and clean throttle body. Do you have cruise control?

Why not run a Dana 300 transfer? No flip required and still lots of parts available.

Just for clarity, did you use the original torque converter or the "new" one off the 2000 tranny? I'm having a similar no go issue with a 96.

There are a bunch of Ford 9" widths available on stock vehicles, depending on make and year. Look for a 31 spline variant. Here's a chart for Bronco's and Pickups: WMS to WMS 57-72 F-100 Pickup - 61 1/4" 73-86 F-150 Pickup and 78-86 Bronco - 65-65 1/4" 66-77 Bronco - 58"

Sounds like it might be a bad sending unit (sensor).

"This whines under power and tapers after coasting" - this sounds like rear pinion bearing to me...

Yes Code 15 No Vehicle Speed Sensor Signal - No vehicle distance (speed) sensor signal detected during road load conditions. Check Engine Lamp will illuminate during engine operation if this Diagnostic Trouble Code was recorded.

Howling is usually bearing noise. From FSM: The axle shaft, differential and pinion gear bearings can all produce noise when worn or damaged. Bearing noise can be either a whining, or a growling sound. Pinion gear bearings have a constant-pitch noise. This noise changes only with vehicle...

My experience has been that you can get more money out of a vehicle by parting it out - if you're willing to hold out for what the parts are worth, if you're willing to do the wrenching yourself, and if you're willing to deal with all the low ballers and people that have no idea what parts they...

ParadiseXJ is correct, ECC = Engine Control Computer. ECC / ECM / PCM /ECU are all the same thing.

The low pinion D30s on the 00 and 01 XJs are the same front axle used on the TJ Wranglers (with the exception of Rubicons that used a D44/D30 hybrid). The high pinion version is stronger because the reverse cut pushes the ring and pinion together instead of pushing the pinion away from the ring...

1) Some gremlins can traced to bad wire harness connectors. I found a bad coil connector on non-XJ jeep (OK I have a YJ too) by wiggling wires until I got the motor to miss. 2) Always check and clean your grounds early in the diagnosic process (right after fuses). 3) Of course, there's the swap...

"From the factory your 1998 would have come with a chrysler 8.25 rear and Dana 30 front" This is not always true - 1998 models with ABS used the Dana 35. If the axle has flat webbing across the bottom, it's an 8.25. Kastein really knows his stuff...

The major components (engine, auto transmission, axles, transfer) can be swapped. Jeep has parts lists that cover '91-'93 and '94-96 XJs so there are some differences, but as you are probably aware, the 1996 has many differences from the 91-95s (e.g., ODB 2). I know that the manual trans...