What is the easiest way to find out?

What is the easiest way to find out?


Jack the rear end up off the ground.

Turn a tire one revolution.

Count how many times the drive shaft turns.

Or check the RPO label

# G44 - Rear axle 3.07 ratio
# GH0 - Rear axle 3.54 ratio
# GM1 - Rear axle 2.59 ratio
# GM3 - Rear axle 3.45 ratio
# GT7 - Rear axle 3.33 ratio
# GU2 - Rear axle 2.73 ratio
# GW4 - Rear axle 3.31 ratio
# G87 - Ring gear 8.50 inch
# G92 - Rear axle performance ratio

Jack the rear end up off the ground.

Turn a tire one revolution. turn BOTH rear tires one revolution.

Count how many times the drive shaft turns.

race on!!!

Jack the rear end up off the ground.

Turn a tire one revolution.

Count how many times the drive shaft turns.

This seems like it would be difficult.

This seems like it would be difficult.


Why? Don't you have access to a floor jack? Or a couple of bottle jacks? I thought everybody had jacks of some kind.

this seems like it would be difficult.
duck soup!

duck soup!

Duck soup???

Or check the RPO label

# G44 - Rear axle 3.07 ratio
# GH0 - Rear axle 3.54 ratioNEVER IN AN '84
# GM1 - Rear axle 2.59 ratioNEVER IN AN '84
# GM3 - Rear axle 3.45 ratioNEVER IN AN '84
# GT7 - Rear axle 3.33 ratioNEVER IN AN '84
# GU2 - Rear axle 2.73 ratioNEVER IN AN '84
# GW4 - Rear axle 3.31 ratio
# G87 - Ring gear 8.50 inch NEVER IN AN '84
# G92 - Rear axle performance ratio IN 1984 G92 MEANS 3.31:1 THERE WILL ALSO BE A GW4.

FOR 1984 THE ONLY DIFF WAS THE D36 AVAILABLE IN ONLY ONE OF TWO RATIOS, THE 3.07:1 RPO #HE3 AND THE 3.31:1 RPO #GW4. DUE TO THE FACT THAT ONLY 210 OF THE 51,000+ 1984s BUILT HAT THE 3.31:1 GEARS THE ODDS ARE THAT YOURS HAS THE 3.07:1 GEARS.

RACE ON!!!

IN 1984 G92 MEANS 3.31:1 THERE WILL ALSO BE A GW4.

FOR 1984 THE ONLY DIFF WAS THE D36 AVAILABLE IN ONLY ONE OF TWO RATIOS, THE 3.07:1 RPO #HE3 AND THE 3.31:1 RPO #GW4. DUE TO THE FACT THAT ONLY 210 OF THE 51,000+ 1984s BUILT HAT THE 3.31:1 GEARS THE ODDS ARE THAT YOURS HAS THE 3.07:1 GEARS.

RACE ON!!!

I don't have an 84 vette so why are you bothering with the nit pickin? Unless you like nits.

I have an 87 vette.

i don't have an 84 vette so why are you bothering with the nit pickin? Unless you like nits.

I have an 87 vette.
Why didn't you post your year?? I was just trying to be thorough, and help you as best I could. If you don't want to know, don't ask.

Race on!!!

I don't have an 84 vette so why are you bothering with the nit pickin? Unless you like nits.

I have an 87 vette.

My 87 has G44 307 gears and a g92 axle ratio eh mean i got 331s as well?

http://i792.photobucket.com/albums/yy204/hokies83/SAM_0309.jpg

Other then sport seats i think im fully loaded options / performance options.

My 87 has 307 gears .... mean i got 331s as well?
No ; read the fine print
G92 means car is fitted with the optional ratio available FOR THAT YEAR
It is not a ratio
In '84 only as noted by CFI above ;G92 was only available on 4+3 cars and got you 3.31

G92 option on ALL '85+ auto cars was 3.07 ( instead of base 2.59 / 2.73 ) which is what you have

I like the rotation counting method. Unless you're the original owner, there's no way of knowing what gear changes may have been made.

No ; read the fine print
G92 means car is fitted with the optional ratio available FOR THAT YEAR
It is not a ratio
In '84 only as noted by CFI above ;G92 was only available on 4+3 cars and got you 3.31

G92 option on ALL '85+ auto cars was 3.07 ( instead of base 2.59 / 2.73 ) which is what you have

I have repo G44 = 3.07 gears + repo G92.

i have repo g44 = 3.07 gears + repo g92.

because there are different standard and performance ratios for different cars in different years, rpo g92 is a meaningless option,

race on!!!

More than likely you have 2.59 or 2.73 or 3.07 all are highway gears so nothing to get excited about.

This seems like it would be difficult.
why would it be difficult? mark the tire, mark the driveshaft..turn the tire 1 complete revolution, count how many revolutions the driveshaft makes . this will allow for any changing of gear ratio that occurred before you bought the car

More than likely you have 2.59 or 2.73 or 3.07.
His label has RPO G44 so IF still original gearset he has 3.07's

why would it be difficult? Mark the tire, mark the driveshaft..turn the both rear tires 1 complete revolution, count how many revolutions the driveshaft makes . This will allow for any changing of gear ratio that occurred before you bought the car

race on!!!

race on!!!
I thought that was obvious.

why would it be difficult? mark the tire, mark the driveshaft..turn the tire 1 complete revolution, count how many revolutions the driveshaft makes . this will allow for any changing of gear ratio that occurred before you bought the car

counting the revolutions of the driveshaft how you tell what gears i mean 1 complete turn would mean what gears,

counting the revolutions of the driveshaft how you tell what gears i mean 1 complete turn would mean what gears,a gear ratio of 1.00:1, which was never made. Observe fractions of a turn very carefully. KNOWING THE POSSIBILITIES, HELPS A LOT.

Race on!!!

a gear ratio of 1.00:1, which was never made. Observe fractions of a turn very carefully. KNOWING THE POSSIBILITIES, HELPS A LOT.

Race on!!!


He's referring to one turn of the TIRE; not the drive shaft.

counting the revolutions of the driveshaft how you tell what gears i mean 1 complete turn would mean what gears,

he's referring to one turn of the tire; not the drive shaft.

he said driveshaft (not tire). I b]bolded[/b] it for those who have trouble reading.

Race on!!!

His label has RPO G44 so IF still original gearset he has 3.07's

Still a highway gear, if he wants performance he should get a set that is lower. I was just stating that all of those high gears run about the same.

Or he could go by what rpm he is running at at 60 mph. 3.07 should be 1800 rpm and 2.73 should be 1600 rpm. I couldn't tell ya what 2.59 gears does maybe 1500 rpm?

a gear ratio of 1.00:1, which was never made. Observe fractions of a turn very carefully. KNOWING THE POSSIBILITIES, HELPS A LOT.

Race on!!!

Well what does one turn of the tire mean by the gears you have

I was just stating that all of those high gears run about the same.
Despite you calling them " highway" gears ,ask anyone that has done the swap ;
3.07 considerably quicker than 2.59 at the track and much better SOTP .


if he wants performance he should get a set that is lower.
Have some things to learn about TPI engines
A stock(ish) TPI won't pull over 4500 so no point going lower than the 3.07's
There are guys who have gone slower in the 1/4 with lower gears because TPI has run out of puff before end of track
Read
http://forums.corvetteforum.com/1568185079-post21.html

This guy only got 2/10th going from 3.07 to 3.73 and he had a Miniram ( good to 6500+ ) and a cam
http://forums.corvetteforum.com/1568186621-post24.html

well what does one turn of the tire mean by the gears you have
it means you should have been under the car counting driveshaft revolutions.

Race on!!!

still a highway gear, if he wants performance he should get a set that is lower. I was just stating that all of those high gears run about the same.

Or he could go by what rpm he is running at at 60 mph. 3.07 should be 1800 rpm and 2.73 should be 1600 rpm. I couldn't tell ya what 2.59 gears does maybe 1500 rpm?

3.07:1 gears get you 70 mph with an auto in 4th od at 2000 rpms with the stockish 26" tall tires.

Race on!!!