I am finally getting my gearbox back together and have got a question. How tight should the nut on the main shaft for the rear flange be?
The similar nut on the input shaft of the differential is torqued to 140 ft/lbs. I don’t expect that that amount is necessary, but if you’re not using a lockwasher, then it should be close to that amount. Somewhere I’ve seen torque values for this nut but I can’t lay hands on right now. I do know that you must be careful with the felt seal in this assembly as you can torque against it and get a false reading and then later the joint will loosen and the gearbox will start jumping out of gear. Make sure the splines have slid past the felt seal before the final tightening. I would agree with 140 ft-lbs, minimum 100 ft-lbs. On the early TD G/B this nut is the only thing locking the speedo gear to the mainshaft. Too much torque could force the split ring in front of center bearing to pop out of its groove. You are tightening against this split ring. First you must make absolutely certain that the felt seal is not trapped between the bearing and the flange. Use oil/grease to help slide the f
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