Re: Torque spec pinion nut
Doh....with 8.8s, there's a crush washer inside that settles right at the correct torque.
What I do with these rears is mark the pinion nut relative to the pinion shaft, # of threads visible and a relative orientation mark as well. I then put the nut back on where it came off and voila, no problemo.
If you haven't done this, you CAN'T put it back to the exact torque originally put on that nut, setting the crush washer. You could easily undershoot or overshoot the original torque spec and you're relying desperately on the torque spec from the factory to be at book specification, which may not be the case. This will create noise if you get it wrong and if left, munch the crown and pinion in short order.
Now, I can see this rear is an 8.8 but, I haven't worked on an S197 directly but, I assume all inside is largely unchanged from previous Mustangs w. 8.8s.