Identifying rear diff 2020 6.2 Z71

johnnyquick · August 10

Hi, guys another question, planning on both diffs, transfer case and Trans fluid and filter, but not sure what and how much fluid to buy.

Was planning on Amsoil fluid

I have a 2020 6.2 with Z71 and locking rear diff 3.23 gears.

I looked for a RPO code sticker but don't see one anywhere.

Do you know how to tell which of the 2 diffs 8.6 or 9.5 ring gear shown on the fluid websites I have?

TIA

Edited August 10 by johnnyquick

CamGTP · August 10

The 12 bolt rear ends are 9.5's.

There is no RPO code stickers anymore, they stopped that around 2017 on GM's.

johnnyquick · August 10

46 minutes ago, CamGTP said:

The 12 bolt rear ends are 9.5's.

There is no RPO code stickers anymore, they stopped that around 2017 on GM's.

Thanks, I will count the bolts tomorrow morning!

JimCost2014 · August 10

Believe 8.6 would be a 10 bolt, 9.5 would be a 12 bolt.

redwngr · August 10

RPO sticker has been replaced with a QR code.

QR code is on one of the labels at the bottom of the drivers doorpost.

Most any smartphone camera will be able to read the code

e.texerado · August 18

this helped me with parts numbers. When I scanned rpo sticker, it doesn't provide all info.

newdude · August 18

On 8/9/2024 at 9:35 PM, johnnyquick said:

Hi, guys another question, planning on both diffs, transfer case and Trans fluid and filter, but not sure what and how much fluid to buy.

Was planning on Amsoil fluid

I have a 2020 6.2 with Z71 and locking rear diff 3.23 gears.

I looked for a RPO code sticker but don't see one anywhere.

Do you know how to tell which of the 2 diffs 8.6 or 9.5 ring gear shown on the fluid websites I have?

TIA

9.5" or 9.76" axle on the 2.7, 3.0, 5.3 and 6.2 engines. The 4.3 was the only engine on this gen that uses the 8.625". That engine is gone from pickups, so is the 8.625".

Edited August 18 by newdude