12-06-2010, 04:09 AM
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CC Member
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Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
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All different setups for rearends and bearings
redmt Red There is a big different between bearing perload on different rearends. Also with and without new bearings. Like you I have been setup up rearends for a long time, most are for the race track. I run them tight. With new bearings in Dana or Salibury rearends I run 25 inch drag, With old bearings I use 10-12inch pounds. I have been running the rearend in my car with a 3.31 gearing. I am using a Detriot locker from a dana 44 jeep housing and in a jag rearend with 30 spline stubs from CWI. I had a bad bearing in the r/s stub shaft and replaced it, other than that 14 years of abuse and no failures. I have not worked on ford 9" rears. Dana's 30,44,60,70,80 and GM 8.5, 10 bolt, and 12 bolt.
Side note about changing fluid, after this is done go to a parking lot and do 10 hard circles to the left and then 10 to the right. then 5 each way. This is to get new fluid between the cluch discs and stop chatter. Under you are in a warm climate, 140weight is way too heavy for rearends. 80-90 is fine. If your fluid gets that hot, add a cooler and pump to the rearend. You can go electric or drive off the pinion yoke depending on room in the back of the car. Rick L.
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