Hello all.

I have a 2002 ZR2 Blazer with an Automatic Transmission an this basically is really to help me find out what rear brake rotors I have.

In looking at the A/C Delco site, an via inputting my VIN number, I get two options, one is listed as:

PN: 177-843....for
Rear; 7.625 Ring Gear Saginaw-American; Lh & Rh; 4WD; 2 Per Veh
Rear; 8.50/8.625 Ring Gear Saginaw-American Axle; Lh & Rh; 4WD; 2 Per, Veh
Per Vehicle: 2; Years: 1998-2002

An one listed as:

PN: 177-851....for
Rear; 7.625 Ring Gear Saginaw-American; 2 Door; RWD; 2 Per Veh
Rear; 7.625 Ring Gear Saginaw-American; Transmission 4 Speed Trans; Automatic; 4WD; 2 Per Veh
Per Vehicle: 2; Years: 2002-2002

Just to mention, at least from the pic's at A/C's site, the diff between the two looks like the first one has a deeper center hub then the other.

As I bought the vehicle new, I have the org purchase sheet an for the rear, it lists is as a G80 Positraction Axle, with a GT4 option of a 3.73 Rear Axle Ratio.

So does anyone know which size my Ring gear is?

Or if not, how I could go about IDing it?

If any other info is needed, please describe.

Thanks for any help.

 

With your truck being a zr2 it should have an 8.5" ring gear

 

And look at this thread too, it will help you decide what you have
GM 7.5, 8.5 and Ford 8.8 axle info - S10 Forums

 

thanks for the reply lazyboyjake.

I took a quick look at it an it looks like the more rounder cover.

Little late an cold to do it now, but will see if I can't get a pic tomorrow an upload it.

Thanks