What fluid to use in rear diff?

[Bernie Benz]

Hypoid gearing requires an extreme pressure lubricant, use GL-5. Tranny
syncros do not work to their full potential with an EP lubricant, use GL-4.
When topping up either, add a half can of engine oil seal restorer to avoid
having to replace shaft seals.

Bernie 

> From: patrick.anderson1 at comcast.net
> 
> Hey guys, 
> 
> What is the consensus on the proper fluid to use in the rear diff? Using
> redline MT90 for the tranny and I think it is OK for the rear diff as well
> since it is an open diff. Thanks.
> 
> Patrick
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