Rear Differential fluid change on a GMC Sierra

[@Mike56-dv4uw]

Is it ok to change the rear diff fluid if it has never been done before

[@737mechanic]

Yes, it is always ok to change the diff fluid no matter how long it has been.

[@jewllake]

I put 3 quarts in mine 9.76. It started to slowly come out the fill hole. I hope it's not over filled. The truck sat like 1 hour after driving when I did the service.

[@edforthewin8574]

Did anything happen? This is my first time doing it and planning to fill it up till it spits out fluid from the fill plug

[@jewllake]

nope!@@edforthewin8574

[@NMFF415]

Good information. Thank you.

[@bobbrown3901]

Where do you get the service papers, what web site,?,Thanks 😅

[@737mechanic]

Prodemand.com but it is a pay service.

[@eddiecarrillo4120]

2013 Duramax 2500HD 6.6 took 4 1/2 quarts

[@shootnguns6075]

If your rear differential is the G80 your not suppose to use gear oil with a limited slip additive and the Valvoline gear oil you are using says "contains limited slip additive". Some people have had problems with gear oil with the limited slip additive and some claimed they have not when using in their G80. Just thought i would let you know.

[@737mechanic]

Yea I saw a lot of people saying this and saying that but I went by what valvoline says and they say it is fine. I have over 10,000 miles since the change and diff has been working just fine.

[@soloM81]

@@737mechanic you have any videos on how to fix a 2016 Sierra on a A/C that doesnt blow cold air

[@Randyman4126]

​@@soloM81It's been a year since your comment,but,did you get your ac fixed??

[@soloM81]

@@Randyman4126 no i did not dealership wants about 2,000 bucks to get it fix the condenser part of radiator started to leak. the condenser was in a recall for bad welds but it does not include 2016 gm as part of the recall

[@bobbrown3901]

How do I tell if my differential is G80

[@shane462]

the gm stuff is now cheaper

[@tranwrx]

Nice