Question about 2003 Chevrolet Silverado 2500HD

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Determine rear axle type (example 4:11)

How do i determine the real axle ratio. I also need to change it, front and rear (4x4). Duramax Diesel 6.6 HD 2003

I am thinking it is a 4:11 and i need to raise the fuel milage on the truck. I am also wanting to know what ratio's are avaliable .


thanks

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The build sheet codes are affixed inside the glove box
It will have the letter G with two numbers after it as like G80. Some may have two letters and one number but unlikely so
The G code will determine the ratio of yours without ripping off the rear cover to count the teeth and divide what you have

Posted on May 31, 2010

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A part-time 4x4 system called Commandtrac is in all Wranglers together with low-end Cherokees and Liberties. A part-time 4x4 system locks the front and rear driveshafts together inside the transfer case so they drive the front and rear axles together in lock step. Because they are locked together, the front and rear tires must rotate at the exact same rpms. However, the front tires must rotate faster than the rear tires during any turn so a part-time system fights that... which makes a part-time system inappropriate on a paved road because the high level of traction on a paved road prevents the tires from slipping which would otherwise allow the front and rear tires to grudgingly rotate at different rpms. Offroad this is not a problem since the poor traction of an offroad trail allows the tires to slip as needed. But when they try to slip/rotate at different rpms on a high-traction surface, the entire drivetrain is stressed which is bad for it. This problem is called "wind-up".

In reality however, the front and rear axles really don't even turn exactly the same RPMs when you're in 4wd so you still get "wind-up" if you drove in 4wd on the street even if you drove in a perfectly straight line. Why? Because 1) you can't drive in a perfectly straight line and 2) the front and rear axle ratios are usually .01 different from each other. Like a 3.73 and 3.74, 4.10/4.11, etc.. Why the .01 ratio difference between the front and rear axles? Because the front and rear axles usually have different ring gear diameters which makes it nearly impossible for the gear manufacturers to economically make the front and rear axle ratios exactly the same. And no, they are not made .01 different on purpose to make the front or rear pull more when in 4wd, that is an old wive's tale.

Finally, a full-time 4x4 system like Selectrac is available on Grand Cherokees, Cherokees and Libertys couples the front and rear axles together, but they are not mechanically locked together like they are with a part-time 4wd system. The front-to-rear axle coupling can be done via either a differential like the Selectrac system uses (just just like what is in the center of an "open" axle) or a fluid (viscous) coupler. The benefit to a full-time 4wd system is that because the front and rear axles are not mechanically locked together, the front and rear tires/axles can rotate at different rpms from each other. This allows a vehicle with a full-time 4wd system to drive in 4wd "full time" on a paved road without problem since there is no 'wind-up' problem to harm the drivetrain. You cannot get a full-time 4x4 system in a Wrangler from the factory.



HOPE THIS HELPS.

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Need a list of rear axles that are compatible with a 2000 Chevy silverado 4x4 1500


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Hello.... I hear some big noise in the rear axle (differential);so i have to change it,but only found the rear axle of a L300 petrol one,when mine is a diesel.So, are rear axles Mitsubishi L 300 gasoline...


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http://www.car-part.com/
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1999 - 2002 Isuzu Rodeo - Honda Passport.
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