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Old 02-15-2006, 04:40 PM   #1
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Gear ratio for my GM TV

Does anyone know how I can find out what my gear ratio is on my TV? I checked the owner's manual- no luck. Someone told me to look inside the glove box for a sticker. THhere's one there alright, with LOTS of numbers but nothing resembling a gear ratio.
I've got a 2002 Yukon Denali.

Thanks!
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Old 02-15-2006, 04:43 PM   #2
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mine is on a tag under the hood. might check there, as well.
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Old 02-15-2006, 04:46 PM   #3
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Originally Posted by chuck
mine is on a tag under the hood. might check there, as well.
HEy, thanks. I'll look!
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Old 02-15-2006, 05:39 PM   #4
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If you can't find a tag telling you, a surefire way is to take it to a level parking lot, put it in neutral and turn it off. Take a couple of your stronger friends with you. Crawl under it. Put a grease pencil mark on the drive shaft, and also put one on the inside side wall of one of the rear tires. Have your big friends slowly push it forward while you crawl along with it. Count the revolutions of the driveshaft while you make one complete turn of the rear tire.

For example: You mark the rear tire at the 6 o'clock position, straight up from the ground, dead center at the bottom. You then mark the driveshaft. As you skinny along under the truck while your buddies push it by hand, count how many turns the drive shaft makes until your tire mark is back in the same place it started. In our example, at the bottom. If the driveshaft turned about three and 3/4 turns, you've got a 3.73. If it turned a little over four turns, you've got a 4.11, and so on.

You can't just jack the wheels up because the differential slip will allow the wheel to rotate independantly of the driveshaft. Unless you've got positraction, that is.

Now, if you can somehow see the driveshaft without getting under the truck, all the better. You could also have someone you really really trust pull the truck forward one revolution with you under it counting, but I wouldn't recommend that. If it's got posi's, then you can just jack it up and turn the driveshaft by hand until the wheel makes one turn. But if you can determine if it's got positraction, you can probably find the ratio

My truck has it printed on a label inside the glove compartment. You might look there too.

Good luck,
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Old 02-15-2006, 06:25 PM   #5
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Axle Ratio

You will probably not find a ratio number in the glove box, but all those numbers and letters mean something. So, go to this site and look through all these numbers until you find one that matches a number on you tag. This is a list of RPO's, that is, regular production numbers. It may look confusing but if you print out the page and take it out to your favorite TV you should be able to figure it out for yourself.

http://www.drivetrain.com/GMtrkratio_posidata.html

Have fun and you will be learning something new about your vehicle too!

Chris
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Old 02-15-2006, 06:48 PM   #6
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You can also take you VIN number to your friendly GM parts counter and ask for a Build Sheet Print out. It will tell you everything that came on the vehicle from the factory including the rear end ratio...assuming a PO didn't change it

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Old 02-15-2006, 07:46 PM   #7
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Quote:
Originally Posted by JimGolden
If you can't find a tag telling you, a surefire way is to take it to a level parking lot, put it in neutral and turn it off. Take a couple of your stronger friends with you. Crawl under it. Put a grease pencil mark on the drive shaft, and also put one on the inside side wall of one of the rear tires. Have your big friends slowly push it forward while you crawl along with it. Count the revolutions of the driveshaft while you make one complete turn of the rear tire.

For example: You mark the rear tire at the 6 o'clock position, straight up from the ground, dead center at the bottom. You then mark the driveshaft. As you skinny along under the truck while your buddies push it by hand, count how many turns the drive shaft makes until your tire mark is back in the same place it started. In our example, at the bottom. If the driveshaft turned about three and 3/4 turns, you've got a 3.73. If it turned a little over four turns, you've got a 4.11, and so on.

You can't just jack the wheels up because the differential slip will allow the wheel to rotate independantly of the driveshaft. Unless you've got positraction, that is.

Now, if you can somehow see the driveshaft without getting under the truck, all the better. You could also have someone you really really trust pull the truck forward one revolution with you under it counting, but I wouldn't recommend that. If it's got posi's, then you can just jack it up and turn the driveshaft by hand until the wheel makes one turn. But if you can determine if it's got positraction, you can probably find the ratio

My truck has it printed on a label inside the glove compartment. You might look there too.

Good luck,
Wow, very interesting. Sounds like something maybe I could get my daughter's boyfriend to do! Thanks!
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Old 02-15-2006, 07:46 PM   #8
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Quote:
Originally Posted by Partsman
You will probably not find a ratio number in the glove box, but all those numbers and letters mean something. So, go to this site and look through all these numbers until you find one that matches a number on you tag. This is a list of RPO's, that is, regular production numbers. It may look confusing but if you print out the page and take it out to your favorite TV you should be able to figure it out for yourself.

http://www.drivetrain.com/GMtrkratio_posidata.html

Have fun and you will be learning something new about your vehicle too!

Chris
Thanks, will take a look!
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Old 02-15-2006, 07:47 PM   #9
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Quote:
Originally Posted by wahoonc
You can also take you VIN number to your friendly GM parts counter and ask for a Build Sheet Print out. It will tell you everything that came on the vehicle from the factory including the rear end ratio...assuming a PO didn't change it

Aaron
This sounds the best yet! Thanks!
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Old 02-15-2006, 08:00 PM   #10
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Don't know if GM is the same but on Ford there is a metal tag attached to the differential cover. It will tell the ratio and if it is a limited slip or not. Example would be 4.10 L meaning 4.10 ratio with limited slip.
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Old 02-15-2006, 08:51 PM   #11
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Double D, There should be a steel tag on the rear end housing where the rear cover bolts to the housing if not on the back check the the front. you will find the info you need, if it is missing just jack up one side of the rear wheels and mark your drive shaft and rotate jacked up rear wheel and count the revelations of drive shaft to one full revelation of wheel.

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Old 02-15-2006, 09:38 PM   #12
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Quote:
Originally Posted by 62 Overlander
Don't know if GM is the same but on Ford there is a metal tag attached to the differential cover. It will tell the ratio and if it is a limited slip or not. Example would be 4.10 L meaning 4.10 ratio with limited slip.
Cool, if we don't get the 1 to 4 of snow and 1/2 inch of ice predicted tonight, maybe I'll crawl under there a take a peek! Thanks!
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Old 02-15-2006, 09:39 PM   #13
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Quote:
Originally Posted by 62 Overlander
Don't know if GM is the same but on Ford there is a metal tag attached to the differential cover. It will tell the ratio and if it is a limited slip or not. Example would be 4.10 L meaning 4.10 ratio with limited slip.
Thanks. Can you explain limited slip?
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Old 02-15-2006, 10:10 PM   #14
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check the glove box, this is where GM lists the option content. Unless this truck was a special order I doubt that it has a 4.10, more likely a 3.73(GT4)
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