Ksths2

iTrader: (1)

I was on the interstate yesterday and thought it would be a good time to test the "rear end gear ratio" test i read about on here.
Putting the car in 4th, go 75mph and read your tach (mine was 3300) now you have to divide that number by 1000 = 3.3

So i'm confused its either a 3.15 or a 3.42 gearing options.... so what is a 3.3?? lol
Yes it has stock sized rear tires on it.

Any ideas? What ratio i've got?

bczee

iTrader: (12)

Is your car a A4 or M6 ?.. a little more information on your car would be helpful. If A4 TC could account for some RPM slipage.

Did you check the Assmebly codes for Options ? Also search for some Gear/MPH Calculators or the Web (I know F-Body.ORG) has one and others on many other sites.

alamantia

iTrader: (10)

check out the GU code

RZRSEDGE

iTrader: (21)

Also is it an F-body or a Vette. No 3.15 in an F-body. I think for F-bodies the codes on the door you are looking for is:
GU2=2.73
GU5=3.23
GU8=3.42
If it's a six speed with the stock ratio; it's 3.42 by default. But I'm guessing that at that rpm at that speed it's not a stock rear gear. I could be wrong so don't quote me as these are just off the top of my head.

alamantia

iTrader: (10)

i thought GU6 was the 3.42

RZRSEDGE

iTrader: (21)

Probably is. I was just going from memory. When stock, mine had the all mighty 2.73!

bww3588

iTrader: (49)

more than likely, they are 3.42's. you have to remember the stock tachs are off a few hundered RPM. and obviously its an M6 or he would be in a world of **** if his A4 was in 4 (OD) and running 3300 RPM.

Ksths2

iTrader: (1)

crap sorry for the delay i forgot about this post. my bad.

Yes its a 02 C5 Vette w/ 6 speed

Where is the GU code on my vette?

Thanks guys!

sciff5

iTrader: (1)

Lol I work for an infiniti dealership and most of those cars are at 3K+ rpm at highway speed in 5th, which is supposedly overdrive.

Scoggin Dickey

iTrader: (34)

It's inside your driver's door. You can also just give me your VIN number and I'll tell you what you have

RE AND CHERYL

iTrader: (31)

3.42

All the M6 Vettes has 3.42 gears.

Re'

Ksths2

iTrader: (1)

sweet - thanks

joe0121

True, only the A4 came with optional gearing(2.10 AND 3.43??, and the Z06's had a more aggressive transmission.

99ssleeper

iTrader: (98)

no the autos came with a 2.73 or the 3.23s. all auto ss's came with 3.23s.

Scoggin Dickey

iTrader: (34)

There's no such thing as an SS corvette

JJ 86

iTrader: (4)

fastvet

iTrader: (2)

My friend has a 2001 A4 ss camaro and it has 3.42's. The only car that I remember coming with 3.23's is the 2002 camaro Z28. the vettes A4 came with a 3.15 in a certain year, just dont remember when.

slt200mph

iTrader: (42)

All C5 Corvettes with a manual six speed transmission have a 3.42 rear end the automatic cars had either a standard 2.72 or a optional 3.15 rear end.

PREDATOR-Z

bingo

Scoggin Dickey

iTrader: (34)

If he has 3.42s they aren't stock. 2.73 and 3.23 were the options in A4 fbodies