Hi. I just finally got around to replacing my leaky pinion yoke on my used 12-bolt with 4.10 gears (see thread here: https://www.chevelles.com/forums/33-...ce-wanted.html
) and have a question about the pinion nut torque.
Before I replaced the yoke and put on a new nut, I measured the specs with a dial indicator and a in-lb torque wrench. It had about 0.0011 backlash (I've been told that is ok for a used gearset) and about 15-20 in-lbs of preload on the pinion bearing (measured by turning the pinion gear with an in-lb torque wrench and watching the breakaway load.)
Then, I used my impact gun to remove the old pinion nut. It flew off - wasn't very tight apparently (this will be important.)
I then pulled out the old yoke, old pinion seal, cleaned things up, checked the front pinion bearing (it seems just fine), put in a new pinion seal, put on the new yoke after applying a little black RTV.
I then used the old thick washer and a new pinion nut and tightened down the nut. Here is my question. It only took 35 ft-lbs of torque to get back to around 15-20 in-lbs of preload on the pinion bearing (again, measured turning the pinion gear with an in-lb torque wrench and watching the breakaway load.) Backlash still measured the same, right around 0.0011.
So, my question is - is only 35-ft lbs of torque on the pinion nut ok? Going any more than 35 ft-lbs on the nut quickly gets the bearing preload increasing significantly. I didn't measure it, but as mentioned above, apparently the old pinion nut was not very tight either.
I didn't loctite the nut because it was dimpled, and I thought I would be tightening it much more. I can always take it off and loctite it for more security.
Any thoughts on what to do here?