epox4life

iTrader: (4)

I looked in the stickys and went for a ride to see what gears I have.

The results are a bit different from what the sticky says.

"Stock Gear Ratios:
M6: 3.42
A4 Standard: 2.73 (GU2 code on the door sticker)
A4 Performance Axel: 3.23 (GU5 code on the door sticker)
WS6 and SS models came with 3.23s.
Your A4 did not come with 3.42s.
If your sticker is gone you tell which gears you have by your highway rpms:
3.23s @ 2000 rpm = 67 mph; 2.73s @ 2000 rpm = 80 mph
3.15s were available in A4 Vettes"

My Results

I do have a GU2 sticker on the door. I bought the car used.

67mph rpm @ 1900

75mph rpm @ 2100

This was cruising with a stock converter locked and in OD.
I double checked my speed with gps. My wheels are 17" with 315/35 tire.

tording99Z28

iTrader: (3)

The best way to tell for sure is to jack up the rear of the car. Put the tranny in Neutral and spin one of the rear wheels one complete turn. As you do this watch the driveshaft and how many times it spins. If it spins 3 1/4 times then you have 3.23. If it spins 2 3/4 times then you have 2.73 and so on.

epox4life

iTrader: (4)

Thanks i'll try that tomorrow. I was looking for a sure way of checking like that.

MattIROC

iTrader: (19)

Your tires could throw the speedo off some, sounds like 2.73's. Where does it shift at WOT from 1-2, and 2-3 at 6000 rpm?

Swift_01_z-28

iTrader: (1)

I am pretty sure I have 2.73s, my door sticker is gone as well, and at 70mph in OD, i believe it is just under 2k rpms.

epox4life

iTrader: (4)

Not sure about WOT shift points, I believe 1-2 is 45mph.

I think they're 2.73's to be honest. Just had hope of something else because I'm 2,100-2,200rpm~ at 80mph.

9000th01ss

iTrader: (10)

What the tire height?

I use this for a 4L60E in OD locked up (otherwise some numbers vary)

gear ratio x .7 x 336 x MPH / tire diameter = RPM

epox4life

iTrader: (4)

315/35/17 = 25.7" diameter

2.73 x .7 x 336 x 70mph / 25.7" = 1,748rpm

3.23 x .7 x 336 x 70mph / 25.7" = 2,069rpm

At 70mph my rpm is right around 1,900-2,000rpm

9000th01ss

iTrader: (10)

Thats correct if you have 3.08 gears. They're usually V6 gears.

Is that rear tire diameter measured by you? or did it come off a spec listing?

9000th01ss

iTrader: (10)

Well you edited that so it could be 3.23's
If you have a factory aluminum driveshaft, you have 3.23's.

epox4life

iTrader: (4)

Spec listing so it could be different depending on tire pressure, etc. I'm going to jack the car up tomorrow and count the drive shaft rotations per wheel turn, that way I know for sure.

Thanks for all the help so far guys.

epox4life

iTrader: (4)

Steel driveshaft, I should have known with those vibrations above 100mph.

panterx1

iTrader: (22)

Only jack one tire off the ground if you do it. Don't have both up, it will throw the count off.

I did this a couple weeks ago and had to lower the other rear tire to get the result.

epox4life

iTrader: (4)

I haven't had the chance to try it yet because of snow. I'll do that when I get the chance.