C5XTASY

I'me debating on a rear end gear change and need the A4 gear ratios for comparison purposes at various rpms for different rear end choices. If anyone can tell me where to find the transmission info, I would greatly appreciate it. I used to have it and cannot find it. No success with "search" either.
Ed

tblu92

A4's came with either a 2.73 or a 3.15(sometimes called the sport gear) rear diffs--You can find the ratio stamped on the diff case--This chart will show you the MPH with differnent RPM's and tire diameters--Just punch in the numbers and hit calculate-- Enter the trans ratio as
.696 & the tranfer case as 1.0 & the tire diameter if stock as 26.6
http://4lo.com/calc/gearratio.htm

Chemdawg99

An easier way is to look in your glove box and check the options sheet. If you see the code G92 then you have 3.15 gears. If not, then you have 2.73s.

Patches

Name
Hydra-matic 4L60-E

RPO Codes
M30

Production Location
Toledo, Ohio

Vehicle Platform (Engine/Transmission) Usage
Y

Transmission Drive
Longitudinally-Mounted Rear Wheel Drive

1st Gear Ratio
3.059:1

2nd Gear Ratio
1.625:1

3rd Gear Ratio
1.000:1

4th Gear Ratio
0.696:1

Reverse
2.294:1

Torque Converter Size (Diameter of Torque Converter Turbine)
298 mm

Pressure Taps
Line Pressure

Transmission Fluid Type
DEXRON® III

Transmission Fluid Capacity (Approximate)
298 mm Converter

Dry: 11.25 l (11.9 qt)

Transmission Type: 4
Four Forward Gears

Transmission Type: L
Longitudinal Mount

Transmission Type: 60
Product Series

Transmission Type: E

Electronic Controls

Position Quadrant

P, R, N, Overdrive, D, 2, 1

P, R, N, Overdrive, 3, 2, 1

Case Material

Die Cast Aluminum

Transmission Weight Dry (Approximate)

298 mm Converter

70.5 kg (155.70 lb)

Transmission Weight Wet (Approximate)

298 mm Converter

80.5 kg (176.16 lb)

TLewis4095

We have a built 3.42 w/hardend output shaft in stock ready to ship if you need.

C5XTASY

Thanks, guys, and Patches in particular. What I was after was the transmission gear ratios for each gear. I want to do a side-by-side on rpms, with a speed calc, on various rear end combinations in different gears. Thanks!
Ed

JOEY P

I have an A4 and the build sheet to my car and the 3.15 gear in a A4...Is Code G90 not G92

JOEY P

Its G90 NOT G92

2KFRC5

Ed, I have a simple EXCEL program that calculates what you're wanting. You easily change the variables to your numbers. Takes into account different wheel/tire sizes.

If you would like it, pm me with your email and I'll send it to you.


Don

Mike Mercury

it's both. G92 says "optional ratio"
G90 says "that optional ratio is 3.15"
makes you wonder what other ratio GM may have initially planned for the A4; but that putz (AlGore) wouldn't allow

on the A4, you can't have the 3.15 and not have both G90 & G92 listed.

So it doesn't matter on the C5 A4.

If you find G92 listed, then you have the 3.15 ratio.... that is a correct statement.


If you find G90 listed, then you have the 3.15 ratio.... that is correct statement.

1KLRTOY

putzalgore is all one word with no capitols

Mike Mercury

_Will_

This is by far the best calculator I've found. The f-body.org calculator is for f-bodies and not c5s, and weight/aero play a role.

http://www.xse.com/leres/bin/gearrat...mference=79.20

Just type your desired gear ratio into the axle ratio box.

C5XTASY

This is great! Thanks!
Ed

00C Just for Fun

Does anybody know the code for 2.83 gears in a C5 A4?

C5XTASY

I believe you mean 2.73 gears. 2.73s were standard and 3.15s were the performance axle option in all C5 A4s. C5 M6s came only with the 3.42s. Also, take a look at post #10 by Mike Mercury. If you're wondering whether you have 2.73 or 3.15 gears, it should answer your question. If not, maybe someone else will jump in.
Ed