MrChaos wrote: just go with the 8.8 as they are significantly cheaper than the xj/mj d44 and people think they are worth their weight in gold. And since you already have it and it is already set up for an XJ sans ABS you should go ahead and just put it in. could you not adapt the rear abs set up from an Exploder ti get abs working properly in the truck?
I found a complete '89 XJ in decent condition with a rear D44 for $1800, but it was in Kansas, seemed like an awful lot of trouble at the time to drag it home just to harvest its axle. Would have likely gotten every bit of the $1800 back reselling it after swapping an 8.25 in place of it's D44. Looking back on it, that's probably what I should have done. If ifs and buts were candies and nuts...
As for the 8.8 ABS question, yes you can, but no I won't.
The late model XJ Cherokees have a 3 channel, 4 sensor ABS system, i.e. there's a speed sensor at each wheel, a separate brake line to each front caliper, but the rear brakes are a single channel, one brake line goes to the rear axle, and it's then split to each rear drum via a T on the axle.
The 8.8 from an Exploder has a single ABS sensor on top of the pumpkin, and one single large tone ring attached to the ring gear/carrier of the differential. I'm guessing Explorers/Mountaineers use a 3 channel, 3 sensor ABS system, since there's only one sensor for the rear, and a single brake line going to the rear axle.
What allows the 8.8s ABS sensor/tone ring to kind-of work with the XJ ABS system is the fact that the 8.8 tone ring has exactly twice as many teeth on it as the XJ tone rings. Some folks, the ZJ folks I mentioned earlier, removed every other tooth from the 8.8 tone ring, and wired the single 8.8 sensor in place of both of the wheel sensors on their Jeep (ZJ ABS is like the XJ ABS). This actually fooled the ABS computer to an extent, no ABS light on the dash, brakes still work, but it often caused low speed unwarranted activation of the ati-lock brakes during everyday driving.
My working theory on the ABS activating all the time on the 8.8 swapped ZJs is due to the fact that the 8.8 tone ring is so much larger in diameter than the Jeep tone rings. So the speed sensors will be showing a big enough discrepancy in "wheel" speed between the front and rear that it activates the ABS when not needed. Tangential Velocity?
I think there's room to fit a tone ring and sensor kind of inside of the hat between the disc and dust shield of the disc brakes on the 8.8, parking brake shoes and doo-dads might be in the way. However most of the Ford cars that have ABS and 8.8s use a wheel sensor at each end, but their axle widths don't match the XJ, and they're usually smaller spline axles, so there may be some other differences I don't know about.
Back to Jeep axles, the buddy I helped pick up the parts MJ a few months back, mentioned it earlier in the thread, turns out it has an AMC 20 axle in it, I didn't see that coming.