front diff torque specs on pinion nut
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Elder User
Joined: Jul 2010
Posts: 534
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From: Kremmling, Colorado
front diff torque specs on pinion nut
2003 f250 SD
I finally got the proper shims to complete rebuilding my front diff. All I need to do is torque the pinion gear down and install my drive shaft. I have the new crush tube in but I cannot find out how much to torque the nut down to. Any help?
I finally got the proper shims to complete rebuilding my front diff. All I need to do is torque the pinion gear down and install my drive shaft. I have the new crush tube in but I cannot find out how much to torque the nut down to. Any help?
Lead Driver
Joined: Jun 2004
Posts: 6,321
Likes: 584
From: Amarillo, TEXAS!
According to the service manual, the Dana 50 and 60 front ends use a preload spec, not really a torque spec. It shows the nut torque could be anywhere from 160 - 500 ft/lbs to get the preload in the 15 - 30 in/lb. range.
Laughing Gas
Joined: Nov 2010
Posts: 1,159
Likes: 33
From: Utah
The crush collar needs to be crushed to reach a bearing pre load spec of ~25in/lbs rotating force for which you measure with a beam type torque wrench and this requires the pinion to be rotated so, the carrier has to be out. Crushing the collar takes a lot of pressure and it can be tricky to creep up on the amount of crush to reach 25in/lbs because it takes so much torque-it's easy to go well past the pre load spec. Barring this, you can use the old crush collar, add blue loctite tot he threads, and just tighten down snug and not crush the sleeve any further.
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