my 92 vert comes with 2.73 what should i get to feel more power i dont know nothing about gears but i've heard a lot about big difference is this a biiiiig job or big money??... thanks !!

 

The BEST gears for your LT1 depends on a few different things. Auto or manual? Intended usage? The type of road driving you do, and your tolerance for cruising at higher rpms. If you R&R the differential, You should be looking at anywhere between $400.00 and $600.00 or so, for parts professional gear setting labor.

RACE ON!!!

 

i got an Auto. i dont intent to race it but i love to take off!! from a stop light i mean from dead stop. i dont drive too much on highways but when i do ..i got in or out WOT! for now i cruise at 70mph at 2000 Rpm. what should i see if upgrade???

 

3.73 were the right choice for me.

 

http://forums.corvetteforum.com/showthread.php?t=973810

 

2.73 = auto

 

the 2.73 is holding you back like you will never understand until you change .......you are in a rock and a hard place.....you can't come out cheap here......you need a 3 series carrier.....buy one wth the 3.07s and you'll spend $$$$$ with the install and all......and after some time goes bye you will want more 3.54s...3.73.... so I say spend 2k and get a D44 with 3.45s or 3.54s or 3.73s and be done wth it the first time! PEACE!!!!!!!!!!!!!!!

 

Incorrect.

 

is that easy ??? just swap to a D44 and... done with it?? is this a bolt on situation ?

 

Something is off. I used a 26" tire for a sample, and 2.73 gears should produce 81 mph at 2000 rpm. My 3.07 gears figure at 72 mph at 2000 rpms. I OBSERVE 2000 rpms at 70 mph. I can write off 2 mph to the deviation in my tire size. Your figures are off by 11 mph. Is your tach that far off? Do you really have 2.73 gears?

IF you had 2.73 gears and cruised 81 mph at 2000 rpms, the 3.73 gears would drop your 2000 rpm speed to 59 mph. 70 mph would come at approx 2400 rpms, with 3.73 gears.

Many Dana 36 gear sets are available from the aftermarket with a "thick ring gear" that allow 3 series ratios ro be installed on a 2 series case.

RACE ON!!!

 

I just went through this process with my M6, and it is the most cost-effective route to get the gearing you are looking for. As CFI-EFI noted in his earlier post, you can R&R the diff, and send to the pros for setup. Call Rich at DriveTrainSpecialists 586-778-0540 and ask him for recommendations and pricing. They have a lot of Corvette experience, a great reputation, and will do the setup for $150 labor if you ship them the diff.

If you're going to build your car and flog it heavily, the D36 has had some longevity issues, so you'll want to consider the D44 at some point. I think there's some info on this in the Tech FAQ.

 

well my RPO says GU2 ....am i missing something????

 

Yeah...the part where the last owner already went through this!

 

excuse my ignorance!!! but how can i know if my gears has been upgraded before??? (dont worry about gettin info. from previou s owner think is dead!)

 

Do you have stock size tires (275-40-17)?

 

Take it easy...I was just kidding. The point was that it looks like somebody along the way may have already swapped to lower gearing without passing that fact along.

You probably wouldn't know what gears you are running for sure unless you checked it before. CFI-EFI made an educated guess at your tire diameter, then took your transmission's top-gear ratio, and fact that your car turns 2000rpm at 70mph, and calculated the effective rear-end gear ratio. Looks like you're pretty close to 3.07.

You can check as follows...

1. Put the rear-end of the car up on jack-stands. (following normal safety precautions, of course.)
2. Chock-block the front tires.
3. Place the transmission in neutral.
4. Release the hand-brake.
5. Mark a reference point on the edge of one of the tires with a piece of tape, chalk, etc.
6. Get under the car, and select a reference point on rear-end of the driveshaft near the differential housing. Scribe one if required.
7. The driveshaft should rotate freely. Turn the driveshaft...counting the revolutions...until the tire has completed one revolution.
8. This will give you the actual rear-end gear ratio regardless of factors such as tire size, drivetrain slippage, tach error, speedo error, etc.

You may already have the 3.07 performance axle, and never knew it.

 

i have 11'' on the rear with 315....

 

If i used that correcty (fbody link)
I could change out my 3.07 and go with 3.54
and its only like 2-300 RPM diffrence on the hiway .


I need to see about that with something around 3.73's too .
then again i have enough projects ... I dont need another one til i get some of these done.



OOPS that was related to this link i saw somewhere on gearing

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