Sounds like you are on track. 
LT1 gearing?
Thread Starter
TECH Apprentice
Joined: Dec 2005
Posts: 366
Likes: 0
LT1 gearing? So i looked on my door to find the "GU2" or "GU5" code....and cant seem to find it....Then i checked glove box and the sticker is there....but about 90% of it is gone and a little piece of it is there with a few codes.....is there anyway i can obtain a new sticker or figure out my gearing?
Last edited by Camaro94SS; Apr 25, 2007 at 04:16 AM.
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
Likes: 4
From: Decatur, TN (N-W of Athens)
"Pull the diff cover and count the gears" method, or take your vin to the dealer. I think they can still print off your RPO sheet.
Or just put in 3.43 and KNOW what's in there
Or just put in 3.43 and KNOW what's in there
its pretty easy to figure your gearing out, especially with 2 people and positraction. one person gets under the car and rotates the driveshaft, and the other person sits beside the back wheel and counts how many times it goes around. if it takes 3 and 23/100 driveshaft turns to rotate the wheel once, you have 3.23's. if it takes 2 and 73/100 times you have a 2.73 and so on and so one. not perfectly accurate but good enough and a lot easier than pulling the cover
Not sure if this is true on the 94, but there are a couple of ways to tell on the 97:
Do you have first gear available on your console? If so, it has a 3.23.
Is your car speed limited to 110 mph? If so, it has a 2.73.
Do you have Z-rated tires? If so, it has a 3.23. This may not work for you, since the tires have most likely been changed.
Do you have first gear available on your console? If so, it has a 3.23.
Is your car speed limited to 110 mph? If so, it has a 2.73.
Do you have Z-rated tires? If so, it has a 3.23. This may not work for you, since the tires have most likely been changed.
You do not even have to do all of that crap pull the cover off and locate the numbers on the ring gear. You will find two numbers with a colon between them divide it and that will give you your gear ration. Or grab the vin call a dealer and they can tell you.
Thread Starter
TECH Apprentice
Joined: Dec 2005
Posts: 366
Likes: 0
I think im gonna take it to the dealer...but yes i have 1st gear available in the console....i think i have 2.73s because my car ran a 14.0 bone stock with only CAI and i was looking through the dyno thread and noticed a 95 trans am a4 with 2.73s that ran 14.0 stock completely.....my car also doesnt have rev limiter and no top speed limiter....im hopinbg its 2.73s so i can put 3.73s and see my ET drop like hell 
Trending Topics
No you don't have 2.73's. Pretty sure you have 3.23's. Just cause you ran a 14sec CAI only, doesn't mean you have 2.73s. They don't kill you that bad. I ran a 13.7 CAI only with 2.73s. Every car is different. You will still feel a big difference from 3.23s to 3.73s. Some people GAIN ET when getting smaller (numerically larger) gears, but that's only because they loose traction.
Last edited by Ralls; Apr 25, 2007 at 06:14 PM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Originally Posted by 01WS6/tamu
You do not even have to do all of that crap pull the cover off and locate the numbers on the ring gear. You will find two numbers with a colon between them divide it and that will give you your gear ration. Or grab the vin call a dealer and they can tell you.
Phone call is quicker than all of the above. But by calculating the numbers on the pinion you know it's dead nuts on. I've never tried the other way so it works however you choose to do it.
Originally Posted by Camaro94SS
I think im gonna take it to the dealer...but yes i have 1st gear available in the console....i think i have 2.73s because my car ran a 14.0 bone stock with only CAI and i was looking through the dyno thread and noticed a 95 trans am a4 with 2.73s that ran 14.0 stock completely.....my car also doesnt have rev limiter and no top speed limiter....im hopinbg its 2.73s so i can put 3.73s and see my ET drop like hell
slick 1851 u got to know wat gear is in your car factor or u cant buy a gear for it. if u have a 2.73 u have a 2 series carrier, and if u have a 3.23 u have a 3 series carrier then means the ring gears are not the same thickness u have to order the right gear or will not work . i know first hand lol
Originally Posted by koolaid_kid
Not sure if this is true on the 94, but there are a couple of ways to tell on the 97:
Do you have first gear available on your console? If so, it has a 3.23.
Is your car speed limited to 110 mph? If so, it has a 2.73.
Do you have Z-rated tires? If so, it has a 3.23. This may not work for you, since the tires have most likely been changed.
Do you have first gear available on your console? If so, it has a 3.23.
Is your car speed limited to 110 mph? If so, it has a 2.73.
Do you have Z-rated tires? If so, it has a 3.23. This may not work for you, since the tires have most likely been changed.
Thread Starter
TECH Apprentice
Joined: Dec 2005
Posts: 366
Likes: 0
Originally Posted by LT1Falcon
no offense but that was a pretty dumb statement. thats like comparing apples to oranges. what was the weather like for both of you? how many miles do each of you have on your car? who can drive better? what kind of tires did you each have? there are so many variables, you can hardly make a comparison
TECH Enthusiast
Joined: Sep 2005
Posts: 503
Likes: 54
From: TX
Heres the easiest way, assuming you have stock sized tires and wheels.
Take it for a drive, get it up to 60 MPH.
If your sitting right around 1800 RPM in overdrive, you have 3.23s
If your sitting right around 1500 RPM in overdrive, you have 2.73s.
Take it for a drive, get it up to 60 MPH.
If your sitting right around 1800 RPM in overdrive, you have 3.23s
If your sitting right around 1500 RPM in overdrive, you have 2.73s.
Originally Posted by leadfoot4
Not necessarily all true, at least not in '96. I have a '96 Z-28. I'm the original owner, and special ordered the car. It has the "Z" rated tires, so it's not limited to 110 MPH; does not have first gear on the selector; and does not have the 3:23 gear. Because it's my DD, and I didn't need the extra RPM while cruising back and forth to work on the interstate, I opted to stay with the 2:73s. Secondly, the 3:23s were a $250 option.
I subsequently looked up the 94 owners manual, and first is always selectable, so it is not true for his car. Just an observation.
