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Changing Rear Oil

crepitus

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crepitus Enthusiast

crepitus

Posted
Posted

So I wanted to change the rear oil in my 06 Sierra. I went to the local parts store because they told me they had the rear diff gasket. When i get there they say it doesnt need one to use rvt. is this true or is there a gasket needed?

grimmysnr Enthusiast

grimmysnr

Posted
Posted

If u have the eaton locker there will be a rubber gasket that is reusable there already. If not then i have heard you will need RTV. The gasket they mention is for one that needs to be replaced. Obviously, you wont know until you take the cover off. I would buy the gasket, take the cover off and inspect the one you have. If it looks worn or whatever replace it if not leave the old one. Im not exactly sure how it adheres to the cover though, GM adhesive maybe? I didnt replace mine so i didnt bother. Being an 06, honestly, you shouldnt have to replace yours yet either.

crepitus Enthusiast

crepitus

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i do have the locker int he rear. so then do i need a gasket? i guess you have to get them from the dealer because i have called 5 different parts stores and no one lists the gasket. they say to use rtv

grimmysnr Enthusiast

grimmysnr

Posted
Posted

RTV is like 10 bucks. I always have some anyway. Honestly, i think youll be fine without a gasket. Your truck is too new to be blowin out the gasket. Just pop the cover and drain everything, be sure to wipe out the old oil too.

 

My vote, is to not bother with a gasket, even if its bad youll know. Then just go buy one if its not leaking now it wont leak enough for you to drive to the parts store.

alaska511 Senior Enthusiast

alaska511

Posted
Posted

I have personally never used a gasket, and change mine annually on every truck I have ever had. Ultra Grey RTV is what I use. Yes with the G80

Genuinefine409 Enthusiast

Genuinefine409

Posted
Posted
i do have the locker int he rear. so then do i need a gasket? i guess you have to get them from the dealer because i have called 5 different parts stores and no one lists the gasket. they say to use rtv

 

 

I don't know anybody that uses a gasket for the rear diff cover. RTV is way better than the crappy gasket. you'll be fine with RTV, just make sure you get both surfaces clean and oil free so it'll seal good.

 

Don't they have drain plugs anymore? my 2000 S10 xtreme has the 8.5 rear and it has a drain plug in bottom of housing.

ken1mod Senior Enthusiast

ken1mod

Posted
Posted

Just a tip. Make sure the fill plug is out before you drain. I have heard many instances where the oil is drained and the plug is stuck solid.

 

Ken

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

Ken is correct. I would also suggest you have a 3/8 drive piece that is square on the end. Many ratchets or pull handles and extensions have rounded corners. The drain plug hole is very shallow and these rounded corners do not fit very well causing you to round out the hole. They make special tools for this but you can find a 3/8" male piece that is squared off.

Ranger Senior Enthusiast

Ranger

Posted
Posted

Harbor freight has a cheap drain plug kit also, worked perfect when I was changing the diff oils on a 80 GMC K-10.

  • 1 month later...
vhbigman Enthusiast

vhbigman

Posted
Posted

Do you use and additives for the rear oil or just synthetic?

V

 

 

I have personally never used a gasket, and change mine annually on every truck I have ever had. Ultra Grey RTV is what I use. Yes with the G80

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