75w90 gear oil for gm trucks

[apollo18]

 

hey guys! 07 escalade ext and im gonna be switching out the gear oil. i was reading alot online thru forums and stuff and it seems like people recommend gm because it doesnt contain limited slip or friction additives which are bad for our differentials? or are they fine?

ive been looking aftermarket and interested in amsoils severe gear, royal purple 75w90 or even the pennzoil full synthetic 75w90 but it seems like all 3 have either a limited slip additive or a friction modifier. is that bad and not allowed? or doesnt really matter

thanks!!

 

 

[txab]

All 3 are fine. Not enough modifier top make any difference. Main thing is there is no need to add a separate friction modifier additive to a G80

[cbrsilv15]

I just changed my front and rear diffs yesterday with Mobil 1 75w90. No issues

[apollo18]

I just changed my front and rear diffs yesterday with Mobil 1 75w90. No issues

how long did it take you? cant be longer then a hour or two?

[diyer2]

I did mine with Car Quest brand full synthetic 75W90 from Advance Auto.

G80 locker, no additive.

No issues.

[cbrsilv15]

how long did it take you? cant be longer then a hour or two?

Only about an hour. Hardest and most time consuming

Part was dropping the skid plate up front and dropping the spare in the back. Lol.

[LongrangeLauber]

You can do it without dropping the spare, lift up with a jack on the hitch as high as it'll go without the tires coming off the ground. Be sure to chock front wheels

I used amsoil severe gear 75w90, good stuff

[Black02Silverado]

Yes, all three will be fine. I have been running AMSOIL's Sever Gear 75w-90 in my 02's G80 now for 165k miles with no issues. Change it our at 10k new and then again at 75k and then again at 172k. Both front and rear. Truck has 175k on it now.