Pinion Nut Torque (1 Viewer)

[matthias]

I'm checking the drive line of my 89 BJ74 with a LSD for vibrations. There is a bit of play in the rear pinion flange up and down when wiggling it. So I'm thinking the pinion nut is loose. I'm also going to replace the U-joints as there seems to be the onset of wear in the races.
What is the recommeded torque for the rear pinion nut? I've read somewhere it's between 181 and 325 ft *lb, which seems a lot. Do I have the numbers right?

Are the pinion nut and u-joints the same for BJ74 as for a BJ70?

Thanks!

Matthias

 

[TwoThirtyDirty]

Hey Matthias, I'm not a mechanic by trade nor an expert in diff setup so please take this as the opinion of a guy who wrenches on his own stuff. I believe the torque spec only applies if you're installing a new crush sleeve between the pinion bearings or if you have the spacer instead. When I did mine, I used a small punch to straighten the stake nut, removed the axle shafts from the axle (should be a piece of cake with f/f) and tightened the pinion/stake nut in small increments until the play was gone but also making sure there was no additional drag on the pinion bearings due to overtightening. Remember to re-stake the nut before bolting up your driveshaft. IME so far so good...about 10k since and no problems though I continue to check for play every so often. HTH.

U-joints should be the same as 70 series/60 series

 

[matthias]

Thanks. That sounds like a more resonable approach. That torque seems way too high a load on the bearing.

Matthias

 

[matthias]

Sweet, that worked like a charm. 1/8 of a turn on the pinion nut took care of any play.

Now I just got to wait till the new U-joints come in.

Matthias

 

[bull]

If it comes loose again throw some thread locker on it