2000 GM, lowest (numerical) factory gear ratio?
12-11-2012, 07:05 PM
#1
Staging Lane
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2000 GM, lowest (numerical) factory gear ratio?
Hey guys, I been on the hunt as to why my truck is so slow at the track, it ran a 17.1 with ltz 20's. Engine is a 4.8 with 4L60E. I have since damaged the sticker in my glove box which indicates my rear end gear ratio code, which I believe it was a 3.23:1 ratio, but because the truck has 10 years of "unknown" history, there is no telling if the truck has a factory rear end or not.
Tech Equations - ThirdGen.org
I used the calculator above and inputted my Wheel radius, speed, and rpm (in final drive) and it tells me I have a ratio of 2.25:1 which i'm sure is not even in the ball park of the lowest factory gear available for my truck, plus I have a hard time believing that ratio is correct.
I read to manually check by turning wheels and counting rotations again the driveshaft rotation and it looks like this is what i will end up doing before i change gears (planning on some 4.11's), but i was just curious what i had now.
Tech Equations - ThirdGen.org
I used the calculator above and inputted my Wheel radius, speed, and rpm (in final drive) and it tells me I have a ratio of 2.25:1 which i'm sure is not even in the ball park of the lowest factory gear available for my truck, plus I have a hard time believing that ratio is correct.
I read to manually check by turning wheels and counting rotations again the driveshaft rotation and it looks like this is what i will end up doing before i change gears (planning on some 4.11's), but i was just curious what i had now.
12-11-2012, 07:55 PM
#3
^^ this, but it's much easier to jack up the rear end, put it in neutral, make a mark on the driveshaft, spin a tire 1 revolution and count the number of times the driveshaft turns.
standard GM truck rear ends were 3.08, 3.23, 3.42, 3.73, and i think 4.10 was also a 10 bolt option
standard GM truck rear ends were 3.08, 3.23, 3.42, 3.73, and i think 4.10 was also a 10 bolt option
12-11-2012, 07:56 PM
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12-11-2012, 09:11 PM
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Staging Lane
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It was to get a baseline run so i can have some before and after comparisons. I been using the truck for spl comps but bored with that and about to remove some extra weight and start playing with it at the track.
12-11-2012, 09:13 PM
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^^ this, but it's much easier to jack up the rear end, put it in neutral, make a mark on the driveshaft, spin a tire 1 revolution and count the number of times the driveshaft turns.
standard GM truck rear ends were 3.08, 3.23, 3.42, 3.73, and i think 4.10 was also a 10 bolt option
standard GM truck rear ends were 3.08, 3.23, 3.42, 3.73, and i think 4.10 was also a 10 bolt option
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12-11-2012, 10:20 PM
#9
Go to compnine.com and put in your VIN#. It will give you a complete list of options your truck came with.
3.42 Is very common for the 2000 year range with 2WD.
The final drive ratio of a 4L60E is 0.69:1 in Overdrive
Rotating the tires and watching the pinion will get you close. The best way to check is to count the teeth on the gears.
If there original factory gears they might even be labeled would either similar to 41:12
This would be 3:42 ratio
3.42 Is very common for the 2000 year range with 2WD.
The final drive ratio of a 4L60E is 0.69:1 in Overdrive
Rotating the tires and watching the pinion will get you close. The best way to check is to count the teeth on the gears.
If there original factory gears they might even be labeled would either similar to 41:12
This would be 3:42 ratio
