Geonovast

Not quite. All it does is prevent the DS and carrier from spinning. It does this by making the inner axle shaft spin just as fast as the outers, but in the opposite direction. It's amazing Disco D30's don't eat those needle bearings like candy, and go through spiders more often. Really the only advantage of keeping the CAD I can think of is to set it up to a manual actuation system, essentially twinsticking the truck without heavily modifying the T-case. Sometimes 2lo would be nice.

You CAD(Central Axle Disconnect) is not functioning. On the right side, under the UCA, there's a metal plate with a vacuum actuator attached. The vacuum lines run to the T-case, and it engages the front axle when you put it in 4wd. Easiest fix is to simply eliminate that function. Remove the vacuum lines off the actuator and T-case, cap the lines on the case. Remove the housing for the CAD, and shim the fork over so it's always engaged. It's pretty simple how it works, you'll see when you get it off. The CAD only survived for a few years, Jeep had completely done away with it after 93.

Just throw whatever you keep behind the seat?

What gearing are you running? If you've got the stock 3.55s that came with the 4 speed, then that would definitely explain your mileage on 31" tires.

:agree: When you find a poly mount, definitely replace the motor mounts with poly ones too. I believe they're ~$16 a piece.

My 2.5 averaged 16 the last few times I checked, but it's still running weird and I don't know why. XJ is getting 25 highway averaging 70mph and 89 octane. Seems to get better once I leave WI, since in Iowa and Missouri I can get gas without ethanol.

The hole in the tunnel is the same.

Shaft length is the same, but the diameter at the tip for the bearing was changed. If you're putting a newer AX-15 on a renix motor, you'll need a 74 CJ 304 pilot bushing.

My first 88 did that shortly after I bought it. Turned out to be bad plug wires.

Yup, the stabilizer cannot actually be the cause. If everything else is working fine, you can run without one with no shaking.

Bring a box of tissues. I could probably do it the week after, I was just looking at doing is as soon as possible. GF's due date isn't until August 13th, but we're pretty sure the kid's coming early, and I would really prefer she not go into labor when I'm elbow deep in Jeep. Only thing really holding it up is I still need something to put on it for a front axle so I can haul it to the scrap yard.

No, but the pilot bearing size for the AX-15 was changed IIRC in 91. The hole in the crankshaft was also changed in 91 with the HO motor. Therefore, in order to mate a post-91 AX-15 to a pre-91 4.0, you need the CJ bearing, as it has the proper outer and inner diameters.

AX-5 is a very sturdy trans, you'll have trouble killing it with a 2.5.

I believe they're all the same, and no, the throwout bearing is not a separate piece. Converting to an external may be a few more bucks, but personally I'd do it if I could. They're much easier to diagnose and repair if there's future problems.

viewtopic.php?f=2&t=17293

Nope, they're all the same in that regard. XJ/MJ AX-15s are identical, and the YJ/TJ units clock the T-case a few degrees differently, but the fronts are all the same.

This weekend's too soon, next weekend's my anniversary, so I'm thinking the 25th would be good to strip out that other XJ. Since my 2.5 has managed to wreck a 35, I'm somewhat anxious to get my 4.10 axles into my red MJ. Are any of you free the 25th or 26th?

I'll supply the food if you come out and help tear apart an XJ. That'd be a good day for that.

It's not metal, it's a rubber boot. A boot from an XJ or MJ with an AX-4/5 or AX-15 should match up ok if you can't find one from an 00 or 01.

IIRC the rear DS is a few inches longer.

You'll need a 91-95/96(Can't remember which) Manual 4.0 ECU.

I've used the engine restore as well, and I suggest using one size bigger than you're "supposed to". For a 4 cylinder the 2.5 is on the larger side, as the 4.0 is for 6 cylinders.

That's what I've been told. I have an 86 2.5 and 93 2.5 sitting out in the shed, but unfortunately the 86 is missing it's head, so I can't check that for sure.

Sweet. That should help conserve the 4.0 blocks for awhile longer. Give it another decade and they're gonna be hard to find. Can't imagine what they're gonna cost though.

BA 10/5/NP231 and AX-15/NP231 use the same front driveshaft.