Rear Differential Gasket

esox07 · Aug 12, 2015

My truck went in the shop yesterday for the frame rust issue. I am hoping to get it back be the end of the week and I want to have all the supplies on hand to do the front and rear differential service as well as the transfer case. I have the fluids pretty much determined but I need to know what gasket I need for the rear diff. It seems it could be one of two. Either the 8.5" - 10 bolt or 9.5" - 14 bolt. I realize I could just get under my truck and count the bolts, but since it is in the shop, that would not be possible. Is there an easy way to tell such as rpo codes or vehicle configuration?

I am looking at the Lube Locker but it looks like they only make the 8.5" - 10 bolt size so I hope that is what I have. If you know, let me know. I can supply additional info on my truck if necessary.
2013 Silverado 1500 LT
Ext Cab
4wd
G80 Locking Rear Differential

19trax95 · Aug 12, 2015

You have a 8.6" 10 bolt. You should also have a reusable gasket. It's a rubber and steel one. As long as it is removed without any damage, it is reusable

esox07 · Aug 12, 2015

The stock gasket is reusable?

Z15 · Aug 12, 2015

The 8.5 and 8.625 use the same housing it appears.

This is the only axle cover I can find available but no gasket.

Chevrolet Genuine Factory Part
Fits 2013 Chevrolet Silverado 1500 LT
Part Number: 25824253
AXLE COVER Silverado, Sierra; 8.50, 8.625

Desclaimer: My info is from on-line parts lookups and it may or may not be accurate or complete.

2013sierrasle · Aug 12, 2015

I changed the fluid in my '13, and the gasket is reusable. No need to buy a new one.

6.2AllTerrain · Aug 12, 2015

I've never used a gasket. silicone it....

Silvery13 · Aug 15, 2015

esox07 said:
The stock gasket is reusable?

Yes. It is rubber on steel similar to a lubelocker.

roorancher · Dec 28, 2020

OK....bust my chops if you want.....I'm reviving Bruce's old thread.was going to change my rear end fluid today, because its the last warm day for a while.

I assumed the truck had a 10 bolt, so I ordered the gasket and fluid, (without looking under the truck......it's a G80 and I'm an idiot, but I digress...)

Well, its not a 10 bolt, it's not a 14 bolt, its a 12 bolt. I counted 3 times. Anyone have a gasket part number?

I'm old school, and I don't want to use just silicone.

Thanks!!!

FoxProDenali · Dec 28, 2020

I just did mine (10 bolt) and my gasket ripped up on top where the brake line attaches. They're super thin and flimsy.

Next time I'll be tossing the gasket for a nice bead of RTV and torquing to spec. Just my $.02.

esox07 · Dec 28, 2020

Well, when I did mine, I think I reused the original gasket. I cannot find where I ordered a new one. They are reusable, but I will be replacing it on my next diff change though.

roorancher · Dec 28, 2020

Actually found the gasket, Bruce, after scouring the internet. GM #22943110.....$29.76 on Amazon.

tsuintx · Dec 28, 2020

Dude... The thread is freaking five years old! :roll:

:mrgreen:

Chevy-SS · Dec 28, 2020

I honestly think there's LESS risk of leak/seepage if you use good silicone instead of the gasket.

Clean and degrease the mating surfaces thoroughly, run a nice consistent bead carefully around the circumference. I usually let it set up for maybe 5 minutes or so, but not much longer, then carefully place (and hold) the cover so as not to disturb the bead, and gently bolt it down, using criss-cross tightening of the bolts, and don't over-tighten. I've been doing it this way for over 40 years and never had one drop of leakage. YMMV

jayr15 · Apr 24, 2023

Does anyone have a link to lube locker 9.5" 12 bolt for 2021 Chevy Silverado 1500

Rear Differential Gasket

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