without a door sticker? Is it in the VIN anywhere?

 

The Vin won't tell you anything unless you take it to the dealer and they look up the options.
Jack it up and see how many times your driveshaft spins for one rotation of the rear wheels. You'll need to mark the driveshaft with something to make it easier (chalk or silver paintpen).

 

If it's the car in you sig and you have a 150mph speedo, you should have 3.23 gears.

Re'

 

Speedo has nothing to do with gearing.
Z rated tires are responsible for the cars the 155 speedo.
Case in point my old `94 Formula was an A4 w/2.73's and GSC tires and had a 155 speedo.

 

It's in your RPO codes on the door. Go to this site:

http://www.camarosource.ca/php/camar...ding&year=2002

and enter your RPO numbers. One of them is your gear ratio. If it happens to be GU5 you have 3.23's. I know 'cause that's what I have.

You're Welcome

**Edit** Dammit, I kinda read over the 'without a door sticker' part. The only method I can think of is to put the car up in the air, put it in 4th (or whatever's 1:1 in the trans) and count the revolutions of the driveshaft vs. the wheels. Do the math and you got your ratio.

 

Assuming everything is stock....

M6=3.42

A4 with aluminum driveshaft = 3.23

A4 with steel DS = 2.73

 

Ding ding ding^^. Easiest way.

 

Look on the door at RPO Codes. Or like mine in Glovebox

GU2 - Axle Ratio 2.73, Rear

GU5 - Axle Ratio 3.23, Rear

GU6 - Axle Ratio 3.42, Rear (Manual)

 

you can do the 50mph test where if u have 3.23 then ur rpms should be at 1800rpm's if i am correct. If im wrong someone correct me but i believe im not. If the rpms are lower then u will have a 2.73 car

 

that really works? wouldnt you need to run the stock size wheels/tires for that to work though?

 

yea sorry didnt get back to you earlier yea i would have to be with stock size tires other wise you would lose more gearing if you went with a bigger size tire

 

nope, they were only responsible for a speed limiter. All LS1 f-bodies came with a 155 speedo, no matter your gear, your tire, or anything else.

 

i was at 1200 rpm at 50. 285/40/17 rear tires

 

yea dude u have to have 2.73's. I have 3.23's with a 275/40/17 tire and my rpms are at 1800. Time for a gear up grade. If you do 3.73's you wont even realizes the car. It will be a new monster!

 

what RPM are you at at like 75 mph with 3.73's?

 

PM me your VIN and I can look up what gears your car came with.

 

Would this work? When helping rebuild the rear on a friend's car, I counted teeth on the ring gear, divided by the number of teeth on the pinion gear and came up with a number surprisingly close to, if not exactly 3.23...and wonder of all wonders, he actually had 3.23's in his car. Just seeing if that's coincidence, or if i stumbled on something there.

 

 

It came out right once. Good enough for government work

 

Woot! I do have 2.73's and was right