I'm getting some conflicting sources on the required fluids for the following components. I am getting ready to make these changes and want confirmation that these fluids will be correct:

Front Diff: 80w90 with GL-5 (doesn't have to be synthetic)
Rear Diff: 75w90 Synthetic
Transfer Case: Auto-Trak II (another manual says to use Dexron VI ATF)

The vehicle is a 07 Suburban 3LT 4WD.

Thanks.

 

I'd go by the Owner's Manual. Or ask the service dept if still unclear.

 

Should you not have your manual available...

 

That's what I used for my 07 Tahoe. Keep in mind it may be different for the Burb if you have the heavy duty version especially for the transfer case. The transfer case has the part number on the rear and mine was a New Process (NP) brand. Like others suggested, check the manual and discuss with service department. I would also suggest a Hayes type manual.

I just did mine and those fluids were dark.

 

Well those are from the manual but the Haynes shows ATF in the transfer.
I purchased the above fluids today along with some coolant for the a flush.

Thx.

 

I got a Haynes manual for my Corvette and after 30 years, I still haven't found a good use for it. Maybe if I ever go back to using charcoal instead of propane, it would make a good fire starter.

IOW go by the manual or your service dept.

 

Factory manual hands down the winner, why have almost good enough, pretty good or almost just like it, when you can have it exactly....