89 XJS v12 (Marelli) 5 speed swap

[Aristides (Aristides Balanos)]

@BobPhx

should I stop now that the witness marks are lined up? Or should I torque to a spec? If so, what’s the right torque? I am thinking this generation of diff uses shims and not a crush sleeve, so guessing I should torque it?

Bob,
See below my experience with the pinion preload, mine has the crush sleeve though.
I would suggest you play safe and put it back as it was, especially if the diff does not make any noises.
If you want to experiment go over the mark only a couple of degrees and see.

And the IRS is out... with pictures

Pinion Seal Preload When I unscrewed the pinion nut on disassembly I had noticed that it was nowhere near the 100 - 120 lb.ft torque specified, and therefore my inquiries for the correct preload figures, I was sure it was not within factory specs… At the picture bellow there are two marks. The first one, with the black line, is the original position. This corresponded at: 50 lbs.ft torque at the nut 8 lbs.in. turning torque… exactly the same with the nut undone, i.e. no preload. The secon…

And the IRS is out... with pictures

Pinion Preload Update You may remember from the previous posts that I adjusted the pinion preload with the hope that it would eliminate a very faint whine on deceleration. The whine on deceleration went away but instead I had the same faint whine on acceleration… The black line, is the original position. [DSC_0157] I loosened the nut back, but not all the way, and found the sweet spot, the whine on deceleration is almost inaudible and no noise on acceleration. [DSC_0328] . Road Test E…