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We've had outstanding success with Redline 75/90w in all of our HP differentials.
Best Regards,
DTE
Then there's the problem of not having a 3:73 differential to put the Redline in...
just kidding DTE...I know you guys are waiting on your supplier to provide you with a *good* batch of 3:73 gears!
Mean while, I have to put up with this terrible whining noise 'till God knows when, since your supplier won't give you a timeline...I don't want to change from 3:73, and I won't buy from anyone else!
If your differential is using stock-type O.E. clutch pack components, than straight Redline 75/90w will suffice. If one is running one of our differentials with our HD clutch pack components, than the additional friction modifier is also used in tandem with the Redline product described earlier.