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Old 01-02-2008, 12:57 PM   #4
BilletGarage
 
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Name: BilletGarage
Title: Diesel Addict
Status: Not Here
Join Date: May 2007
Location: Minneapolis Suburbs
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Posts: 723
Quote:
Originally Posted by Sledpuller
I wouldn't, 140 is for extreme loads, I don't see that kind of pressure inflicted on the front during drag racing. I always ran Amsoil 75-90 in the front sled pulling, with zero issues, and that was with hanging weights.
For drag racing, I wouldn't run 140 in the rear, either.
Quote:
Originally Posted by Kleetus
I agree... and actually, Ford's front fill isn't synthetic either.. just the rear.

The front is 80w/90 dino, and the rear is 75w/140 syn. The heavier weight oil would probably hurt you for windage losses.
Good information! Thanks. I do a fair amount of towing with the truck as well so not sure it is wise to drop back on weight for the rear axle? What do you think? But, I will definitely be running 75W-90 Severe Gear in the front now.

Dino Oil in the front diff? But the service interval is still 100,000 from Ford? Am I missing something?
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