Front Diff Fluid

[Bronk351]

Well after going through deep water ive accumulated water inside my front dif. I still haven't checked out the T case nor rear axle yet. Transmission fluid is fine.

Well i looked through my owners manual and all it says for front diff fluid is, the capacities (3.8 Pints) Service to the bottom of the fill hole, and nothing about what weight oil it takes, Does say add two ounces of Friction Modifier to the front LS axle.

So i went to autozone and they said it takes a 90w ****. Wellll... What exactly is that suppose to mean. I know 80W90 75W90 are just a couple of different options.

I ended up going with the 80W90 and the friction modifier.

 

[BB33's]

You made the right choice with the 80W90. A straight 90W is way too thick for a limited slip front axle. You could have even gone with 75W90 and been just fine.

When filling the tranfer case use ATF. An actual oil like 90W is way too thick.