Yea, I understand its from a XJ its still a VAD system, why install it in a TJ then use the full axle shaft? And how he stated Napa didn't have the 11800 seal "ANYWHERE", Napa just like any other parts store is more than gladly order it for you annnnd any other part store can cross reference the part number for you.. Well thats how I got mine and it works fine..
I went to napa with that number, and they did not have one that matched that part number in any of the locations in my area. They could order one but it would take weeks. I went elsewhere and found something that worked.
I'm putting a XJ HP d30 into my TJ for a few reasons:
High pinion = better DS clearance and drive line angles.
No crush sleeve = Easier to change pinion seals/work on the axle in general
4.10 gears = Could not find a TJ axle available for a good price that had 4.10 gears to match my 8.8
Reverse cut gears = Gears "pull in" when being driven, as opposed to a low pinion setup that "pushes away". This results in a stronger R&P setup.
I couldn't find one with 4.10 gears without the VAD. I removed the vacuum actuator, shafts, knuckles etc from the housing, made a block-off plate and I will replace everything save the housing and gears with TJ stuff. Why? So my unit bearings and brakes are TJ parts, not XJ stuff. This saves me from having to buy all new parts. I COULD use a cable disconnect system and retain the two piece shafts, but I would rather not spend the $250, and I like the idea of less moving parts. Also, my TJ shafts use bigger U-joints than the XJ shafts that came with the axle assembly.
...why would I NOT use the full axle shaft when my jeep was never set up for a VAD system to begin with?