Fact or Fiction ?

Darter6 said

I know of guys using 0-20 or even 0-10 in the engines,, but was thinking for the rear...Why not ?The car is for drag race only. I'm planning on a swap from 3.73 with sure grip to 4.30 set up that I have with a spool in a low H.P.(300) car. When I go to buy new rear tires.Plan on 27.5'' from the 26'' I have now.

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At your performance level , just buy gear lube.
Unless you will be running a letter class , you are just shortening the life span of parts for no good reason.
If you are confident in the seal , maybe spring for synthetic if reducing friction is that important to you.
But the fluid in your rear end absorbs shock as well as lubricates.
It would make no sense to try and squeeze .004 of a second at the cost of significantly shortened life span of your ring and pinion , and God forbid , it decides that enough is enough on the big end , you will re think everything you were raised to believe in.