Rear differential size?

[ShortyMatt]

There are 12 bolts on the cover of my 2018 sierra 1500 5.3's rear.  Does that by default mean I have a 9.5 differential?

 

I hate asking the internet but I've spent hours googling and I'm getting so much conflicting info.  Normally I can cross check enough sources and figure out what fits.  Some vehicle specific sites are pointing me at the 8.5 which doesn't seem correct.

 

I'm doing a posi by the way.  Should be pretty sweet.

 

Thanks for your time.

[Black02Silverado]

Someone on here will be able to help but will need your VIN to see exactly what you have. 

[BlancoSilverado]

I would say try calling a dealer parts department with VIN, see if they can tell you what came stock.

[HeySkippyDog]

Look on the passenger side of the differential. It will be marked.

Sent from my SM-J810F using Tapatalk

[SierraHD17]

It's either the 9.5 or the 9.76.  Anything with a 5.3 has either of those 2 axles and only the trucks with V6s had 8.5's.  

 

If you have the NHT option code in your glove box it's the 9.76 and if not otherwise it's the 9.5.