Truck Repair Proper torque on pinion nut???

wjhuskey

Well-Known Member
We recently put new u-joints in our rear drive shaft of our 1993 Peterbilt 379 with a 15 spd tranny. We put a brand new yoke on the rear end today but wasn't sure about how much torque to tighten the pinion nut? Anyone know??? Thanks in advance.
 

mndriver

curmudgeon extraordinare
Supporter
Wait...

You said rear end or transmission?


I'd think it'd be similar. But that's for a 15 spd transmission.
 

r3gulator3

IMA KEEP IT REDNECK
We recently put new u-joints in our rear drive shaft of our 1993 Peterbilt 379 with a 15 spd tranny. We put a brand new yoke on the rear end today but wasn't sure about how much torque to tighten the pinion nut? Anyone know??? Thanks in advance.
Any shop doing the work is going to use a new locknut and hammer it down with a 3/4 impact. But the torque is based on the nut size. If is a 2 1/4” - 2 1/2” nut then yeah it’s around 650 ft-lb. To get more accurate to torque some places use a tool called a raptor. It’s a air/hydronic deal that braces itself against the nut with and arm and then turns the nut. But 90% 3/4 impact hammer it and go.
 

Duck

Green banner
Supporter
Any shop doing the work is going to use a new locknut and hammer it down with a 3/4 impact. But the torque is based on the nut size. If is a 2 1/4” - 2 1/2” nut then yeah it’s around 650 ft-lb. To get more accurate to torque some places use a tool called a raptor. It’s a air/hydronic deal that braces itself against the nut with and arm and then turns the nut. But 90% 3/4 impact hammer it and go.
Ain't no crush sleeve in there like on a pickup truck axle?
 
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