Welcome to the Corvette Forums at the Corvette Action Center!

Help! diff questions

BlueL82

New member
Joined
Jan 26, 2019
Messages
1
Location
Tennessee
Putting together my 1980 dana44 and I have a question. What exactly is the pre load that I am looking for with used bearings? The bearings in the diff I'm rebuilding are in amazing shape, the cross pin isn't even worn. Online the pre load is recommended at 14-19 inch pounds. My book says 15-35 inch pounds, which is for new bearings.

Suggestions? I want this diff to last.

Thanks.
 

tstein81

New member
Joined
Apr 9, 2010
Messages
3
Location
North Idaho
Corvette
1981 White 4-spd Coupe
Hi BlueL82, sorry I didn't see your post earlier, but if you still have questions about preload here is my 2 cents. I assume you are talking about pinion bearing preload. If you check the websites of diff retailers i.e. yukon, etc, they typically have setup specifications. Remember to use the D44 Corvette specific numbers. 14-19 in lbs is correct for new bearings. used bearings are typically about 50% of new, in this case Yukon lists 6-9 in lbs for used bearings. This is important because the new bearings will wear in relatively quickly and then remain fairly stable for the life of the bearing. So new bearings, use the new specs, used bearings, use the used specs. You do not want too much preload on bearings that are already worn in. remember also, new seals will typically add 1 in lbs each. The seals will wear in also and the total preload will correspondingly drop slightly after wear in. It is a big job to do so new bearings are always recommended, but you be the judge of how many miles you plan to be driving and whether you ever plan to do this job again.
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Parts/Accessories:

Vetteskins

Advertise with the Corvette Action Center!

Double Your Chances!

Partners

Top Bottom