RPO Codes For Rear Gear Ratio

[Yenko]

Originally posted by Blazin Low
look in the glovebox at the RPO codes.

GU2 2:73 ratio

GU4 3: 08 ratio

GU5 3:23 ratio

GU6 3:42 ratio

GT4 3:73 ratio

GT5 4:10 ratio

GQ1 Open Differential Rear Axle

G80 Positraction/Locking Rear Axle

[lowestyet1]

is there another place to look at what you have? i have a diff dash now.

[Yenko]

Take the VIN number that is on your vehicle title to the local dealership and ask them what gear ratio is in your rear end.

[lowestyet1]

thanks.

[blazin8]

You can also look on the rear end. It will be on the passenger side axlehousing just inside the leaf spring perch on the front side.

[IGOTBAGD]

I checked mine and it said ("GQ1" Open Differential Rear Axle)

What does this mean?

[blazin8]

It basically means you have a standard rear end with no traction adder of any kind. If you are looking in the glove box, both codes should be there. The open rear diff code and the ratio code. Check it close for both.

[IGOTBAGD]

I have a 1993 Blazer 4X4. All I could make out was GQ1

[blazin8]

Look on the glove box sticker for one of the other codes at the top of this post

[IGOTBAGD]

GU6. Thanks.

[Blazin03]

All I had was GU6. And when I jacked it up yesturady I could spin the tire while the other was on the ground. So that mean its open 3:42?

[blazin8]

yup

[TWIZTID EXTREME]

ok my 03 says:
GU6 3:42 ratio
G80 Positraction/Locking Rear Axle

and G75 whats that?

[wheels]

Originally posted by TWIZTID EXTREME
ok my 03 says:
GU6 3:42 ratio
G80 Positraction/Locking Rear Axle

and G75 whats that?

s-10 forum says: G75 GVW RATING , "4,550 LBS"

a list of gm RPO codes says: "axle rear: 3.62 ratio"

so i'm guessing 3:62's

[s10blaza]

do all 2wd s10s and blazer rear ends interchange from all years? Say if I found a 2nd gen 2wd with posi and 3.73s?