Differantial oil

[gooffeyguy]

Is gasket on the rear reusable?

Yes if it's in good shape

 

[swathdiver]

Would you be able to point to written documentation of said change of recommendation?

Yup, my 2012 owners manual shows 75w90 synthetic for both

View attachment 393117

I cannot find the pages where I learned this save one. I might've been in error.

You see Tom's manual is for a Denali and that recommendation coincides with the one in my AllData shop manual for a full time front 4WD axle. It also lists the part time 4x4 axle and says to use 80W90.

We did write about this last year, I just cannot remember or find it. Maybe I was wrong, it certainly seems so according to my AllData.