Which fluid to use?

[Portedfrankenstien]

Anybody know the fluid for the front diff in my 99 yukon? Is it 75w-90 or 80w-90?

 

[shamrock246]

Both the front and rear of mine has 75w-90 Amsoil with no issues.

 

[Portedfrankenstien]

Awesome. Thanks, man. I don't think it's a big enough difference either way to cause problems, but I'd rather be sure i guess