Pinion Nut torque #?

[Chris McDade]

Does anyone know what the pinion nut torque specs are?

Thanks in advance

 

[49-blues]

I think it is around 225 ft lbs-i used a long persuader pipe on the end of a wrench and jumped on it.

 

[RmvBfrFlght]

It usually takes some where in the range of 250 to 350 ft/lb's to get the proper torque.

However, the pinion nut isn't torqued to a particular value. What needs to be done is to read the torque it takes to rotate the pinon (without the carrier in place), and tighten the nut for the proper pre-load.

This is done with an in/lb beam or dial style wrench. With new bearings the pre-load should be between: ... OK, can't find it for the 8.5" rear, but did find it for the GM 7-5/8" rear. The values are:

New bearings: 15 to 30 in/lb
Used bearings: 9 to 15 in/lb

Note that the pre-load is in inch-pounds, not foot.

The values I listed could also be used for the 8.5" rear. I've always recalled them being in the same range whether it was for a 12-bolt, 10-bolt (older one), or the 8.5" 10 bolt.

RemoveBeforeFlight

 

[Chris McDade]

Im going to go with 225lbs.

Thanks for the info.

 

[driveshaft man]

Keep in mind ...that torque # is on a NEW crush sleeve. If you are just replacing a seal, 120lb+/- with red locktite on CLEAN nut/threads will do fine as long as the bearing preload is not too tight.Preload is THE most important consideration here.

 

[mikestertwo]

.Preload is THE most important consideration here.

+1

 

[Louie L.]

Chris,
As stated above, Do not crank on a used crush collar @ 225 ft lbs. That is only on a new un crushed collar.

 

[Chris McDade]

It's makes since. I hit it with a impact and it got tight, so I wasnt sure.

I will torque it to 100lbs + and see what it feels like.

Thanks

 

[gunslinger]

What everyone is saying is don't torque it. Tighten the nut until you've reached the proper pinion bearing preload.

By tightening it to a random torque spec, you run the risk of tightening it too much and cooking the pinion bearings.