Confirming gear ratio

[deerefan]

I noticed on the swindow sticker of my new 11 slverado z71, it said I have 3.42 gears. Is there a way to confirm this through the vin number or other way?

 

[timswi]

I noticed on the swindow sticker of my new 11 slverado z71, it said I have 3.42 gears. Is there a way to confirm this through the vin number or other way?

Not that I know of, unless you can get to the GM vin decoder...So far, I've found the stickers to be accurate...You could always do it old school by jacking it up and counting the revoulutions of the driveshaft to one full wheel turn..Get you in the ballpark anyway.

 

[Diamondpilot]

Not that I know of, unless you can get to the GM vin decoder...So far, I've found the stickers to be accurate...You could always do it old school by jacking it up and counting the revoulutions of the driveshaft to one full wheel turn..Get you in the ballpark anyway.

That does not work with GM trucks with a G80 locker. I have tried and it does not work.

If you bought that truck new the window sticker should be good enough proof. There is no code I know of in the Vin# that tells rear end. It tells other things like plant, engine, tranny, ect.

On Fords the door sticker has a axle code. I also find it on most rear ends on a data plate on the axle itself.

Chris

 

[Patches]

Not that I know of, unless you can get to the GM vin decoder...So far, I've found the stickers to be accurate...You could always do it old school by jacking it up and counting the revoulutions of the driveshaft to one full wheel turn..Get you in the ballpark anyway.

If you use this method, jack up one side, leaving the other on the ground, unless you have a locking rear differential :thumbsup:

 

[firefighter jim]

Yes, Inside glove box is a label. GU6 code is 3.42

 

[timswi]

That does not work with GM trucks with a G80 locker. I have tried and it does not work.

If you bought that truck new the window sticker should be good enough proof. There is no code I know of in the Vin# that tells rear end. It tells other things like plant, engine, tranny, ect.

On Fords the door sticker has a axle code. I also find it on most rear ends on a data plate on the axle itself.

Chris

One turn of the passenger side, is one turn...Main drive wheel, like forever...Unless something has changed.

The glovebox code is another good idea.

 

[Diamondpilot]

One turn of the passenger side, is one turn...Main drive wheel, like forever...Unless something has changed.

The glovebox code is another good idea.

When I tried this on my 3.73 geared G80 equipped 2005 Dmax I had it took 5.5 turns to get one revolution of the drive shaft. I confirmed this with both sides. I then tried turning the drive shaft and 3.7 turns rotated the wheels one revolution.

I agree, it should work but just did not on my G80 equipped truck. I have done this 100's of times on open and limited slip diffs and it worked fine, just not for me on the G80. Not sure why?

Chris

 

[Toyboy]

See if this helps

What gear ratio do I have in my GM or Chevrolet rear end, do I have positraction - Drivetrain.com

 

[RobertN]

I've always confirmd by looking at the tag on the diff. Do the new trucks still have those? My '01 does, but that is almost ten years old now. FWIW, my tag on the diff matches the code on the tag in my glovebox, and the original window stick of options.

 

[hawkeye08]

Join the gm truck forum and post a request for a build sheet for your VIN or lookup all the RPO codes to see what you have.

GM-Trucks.com -> Fullsize Truck & SUV

RPO lookup
GM-Trucks.com| RPO Code Lookup

 

[deerefan]

Join the gm truck forum and post a request for a build sheet for your VIN or lookup all the RPO codes to see what you have.

GM-Trucks.com -> Fullsize Truck & SUV

RPO lookup
GM-Trucks.com| RPO Code Lookup

I found the code, GU6, and confirmed 3.42. I figured it had it but just wanted to verify for my own knowledge.

 

[LD1]

This is the simplest thing to do. That tag has all the RPO codes for how the truck was built. GU6 is what you're looking for.



You got 5.5 turns because you were turning the spider gears. The drive shaft method is the only way to do it.

Yep. If you do the wheel method, it is only accurate if the opposing wheel is turning the EXACT same amount. But I always turn the DS and count the tire.