1996z28

iTrader: (13)

99 Trans AM A4, do I have the 2.73's or the 3.23's? How do you tell? Let me know. Thanks

THE LAST Z

iTrader: (5)

if you floor it, when does 1st gear end? is it around 37-40mph?
then you have 2.73's

3.23's will be shorter than that.

I have 2.73's and by the end of 2nd gear im doing 80mph. I hate these gears.

THE LAST Z

iTrader: (5)

wait a minute.... Your car does 11's and your asking what gears you have?

SHINER

iTrader: (18)

call the dealer with the VIN, and they will tell you, or just look up your RPO code

johnpate01

iTrader: (3)

Look at the RPO code list on the interior edge of the driver door. Assuming the rear hasn't been touched, you have 2.73 gears unless there is code GU5 listed. If so, then you have 3.23 gears.

sykotic

Notice his name is 1996z28 and he's asking about a 1999 TA, he's not asking about his car. Awesome times btw daniel, you goin gears next?

2001whiteSS6spd

This is a simple way to find out.

Mark your inside tire, mark your drive shaft.

with your vehicle lifted and in neutral spin your drive shaft and see how many times your drive shaft spins compared to your tire. Example if your drive shaft spins about 2.7 times compared to your tire once around you would have 2.73's and so on.

I hope this make sence its pretty simple.

Eric

JerseyLS1TA

iTrader: (2)

Or you could do it the easiest way possible, look at the sticker on your door for the RPo codes. GU2: 2.73, GU5: 3.23 It's as simple as that

THE LAST Z

iTrader: (5)

oops...

BIRDONNOS

iTrader: (3)

yep thats the way to check your gears

2001NBMZ28

If you suspect they may have been changed check the RPM/MPH against a calculator - like www.f-body.org/gears/

daniel6718

iTrader: (36)

couldent you just look for a 1st gear on the console if its not there you have 2.73

98_Formula

iTrader: (15)

?? my car gets to about 45 in first.... A4 (assuming 2.73's) but not sure... i hope its only 2.73's ... cuz then that means there just that much more in her...

OctaneZ28

iTrader: (6)

This is the easiest way to find out what gears the car came with.

99Z28camaroman

iTrader: (10)

There are some strange quotes in this threads about 2.73's and what mph in first and second gear?

I get 50mph in first gear and 95mph in second gear!

That was the same on my 95 Z28 A4 2.73 LT1 also.

If anyone is getting 37-40mph first gear and 80mph second gear they can't have 2.73's?

94 z28 A4

I can only do 55mph in second. I think i have 3.73's. Does that sound right?

burnzilla

iTrader: (3)

Now this is actually helpful advice.
Although the sticker is in the glove box, it was still better than some of the other posts.

Some of you guys just need to hold yourself from typing.


Open your Glove Compartment, and empty it out. There will be white sticker on the bottom, with rows of Production Number Codes, in A-Z Order.
Skip ahead to the letter G, and if its GU2, you have the worst gears possible, 2.73's. GU5 is 3.23's, and 3.42's I think is GU6, I have the GM Gear Sheet, If I find it ill post it .

Also, cars equipped with 3.23's were given a small tranny cooler.

99Z28camaroman

iTrader: (10)

If your doing 55mph in second maybe your gears have been changed to after market such as 3.73's as you say.

Try using the gear calculator it should tell you what your running without getting under the car

http://www.f-body.org/gears/


There is another way, I think it's see how many turns of the drive shaft it takes to do one revolution of the back wheel.

blue01ta

iTrader: (4)

That's how I do it. The RPO code tells you what the car came with not necessarily what it has now. My RPO code [if all you chose to do was look at it] would tell you I have 3.42s, but that's wrong.