pinion bearing preload question

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mischiefdart

mischiefdart

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I setting up a crushsleeve eliminator and want to know how many inch pounds if drag is good. The pinion seal is not installed so will not affect the reading. My factory service manual calls for 20-25 but I am assuming that is with the seal installed. You members that build rears, what do you set your prelaod at? I am leaning more to like 10 inch pounds but want experienced input. Thanks.
 
They normally give a spec for new bearings and used bearings 10 sounds a little low even for used. You understand that the diff case is not installed when you do this correct ?

Brian
 
I've seen different specs for different rearends but middle of the road is 20 in lbs for new bearings and 5-10 for used bearings.
 
I do mine by feel after im sure I have the right shims or what ever just a small amount of drag to get the play out.........and don't for get to put grease on the seal!!!!
 
20-25 W/ New bearings, 5-10 with used bearings. But i usually do it by feel since I have been doing them for a while.
 
Look in the service manual for something that as a 742 early carrier. They do not carry a crush sleeve. That spec would be fine to use.
 
Thanks for all the input. I usually did mine by feel too but this is for a customer so I am buying a KD 0-60 in/lbs torque wrench. It is only $40 if you shop around. The rear is a 12 bolt and I am installing 4.10's and a new eaton posi in it. It is going in my friend Tom's '66 Biscayne with a big block and a four speed so I want to make sure it is up to the task.
 
Well I am glad I bought the torque wrench. I am surprised how much effort it takes by hand to turn the pinion at 15lbs/inch. Thanks for your input supershafts, it is nice to hear from someone in the business.
 
It is a KD 2955 and if you google it you will find a bunch of dicount sellers. Lists for $77 but cheaoest I saw was $40 plus shipping.
 
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