92 RS 305 Auto

I'm trying to figure out what ratio gear I have.
The car still has the sticker in the rear compartment, I just don't know which one it is.

if you want to know what you have pull the cover and look, the codes will only tell you what it left the factory with

It's the original gear.

Providing it's still original

92 RS with a 305 and automatic transmission has 2.73 gears in the diff. No other gear options available for that package. It will also have 28 spline axles.

If it had a manual transmission, it would have had 3.08 gears.

The axle codes on your sticker start with the letter G. The 2.73 ratio is code# GU2. If you happen to have code# G80 right next to it, that code denotes posi. 3.23 is code# GU5, and 3.42 is code# GU6. I think 3.08 is code# GU3 if I remember correctly. As you can see, the code numbers kinda go in sequence with the ratio (i.e. the higher the code#, the lower the gear ratio).

Thanks everyone, the gear is a 2.73

I found this one

Category - Richmond Gear GM 10-Bolt Ring & Pinion Sets, last catagory 4th one down, can someone tell me if it's the right gear for my car!?
836-49-0007-1 <--part #
Ratio: 3.73, 2-Series <--2 series for 3.08 and lower carrier
Teeth: 41-11
27 Spline Pinion <--I have a 28, is this a problem?

Also do I need any other parts for a complete install?

All 7.5/7.625 10 bolt diffs have 27 spline pinion splines. That's the splines that your driveshaft yoke slip onto. You have 28 spline axles.

And yes you need gears to fit on a 2 series carrier.

Thank's bro ! :>)

Other parts required

New bearings would be nice. You'll need an install kit. The pinion depth is set by a shim under the pinion bearing. The bearing is pressed onto the pinion. It's very difficult to remove the bearing without destroying it. Setting the pinion depth becomes a one shot deal unless you have a special bearing set up to do it. Any shop that sets up diffs will have a bearing with the center machined out slightly larger so that it doesn't need to be pressed on the pinion. They can then easily slide it on and off while changing pinion shims. Your one shot deal is to remove the old bearing from the pinion and take the shims from the old pinion and put them onto the new pinion. Press the bearing on and check your gear pattern. If it's out, you're going to need another bearing unless you can find some way to get the new one off without destroying it just to change the shims.

The install kit will include bearings and races, shims, crush sleeve, gear marking compound, cover gasket, pinion seal and probably the pinion nut. It won't include any instructions.

Very much apprieciated bro!
I will order a new set of bearings with all the goodies.

I forgot to mention, I now understand the 27 spline pinion and 28 spline axles.
Two parts that work together but have different splines.

Just another tip. If you really have to have a special pinion bearing that slides on and off for setup, Reider Racing sells them in a kit. I'm seriously considering one for my future setup since it's pretty much a 99% guarantee you'll destroy the new bearing if you try to press it off again to adjust the shim. Most guys who've set them up say a .030 shim works right almost every time though.

i have the same car now are they 273 posi/ lsd