Help. Pinion shaft torque spects

Posted by gone1951 On 2008/7/4 17:25:48

I replaced the pinion shaft oil seal on the differential of my 51 300. The nut that held the yoke in came off with very little torque (too easy). I need help figuring out what to torque the nut back to. The book says to torque it from 300 to 325 foot pounds. This seems way too high. The book says to note the torque it takes to overcome the friction of the new seal and add 2 1/2 to 3 foot pounds too it for a total of say 4 1/2 foot lbs. This can't be the overall torque for the nut. I read it to mean the torque it takes to over come the seal drag plus the bearing friction after the torque on the nut is correct. There is no way to measure over all force to turn the pinion shaft that I know of without removing the rest of the universal and leaving only the pinion shaft in the housing.


Can Anyone help me? What should I torque the nut to if nothing else has been changed except the seal?


Thanks, Bob