Axle Ratio

[mhagie]

I am about to purchase a 2001 D/A how do I find out if it has a 3:73 or 4:10 axle?
how about limited slip?
I am under the assumption there are codes that will tell this info,where do I find them? what are they?
Thanks in advance, Merle

[20050420|7|006071|000022|69.19.2.78]

Hello Merle,

i thougt, the D/A come only with 3.73 ratio. :confused:

[DmaxMaverick]

Nova's correct. The only OEM option with a Duramax is 3.73.

If it has a locker (no limited slip since ~94), the RPO sticker in the glove box will have a "G80". The locker is part of several option packages, but change from year to year.

[mhagie]

Thanks guys I know a bunch of the 6.5's came with 4:11 so I was afraid the D/Max was the same.
Great news, if it had a 4:11 I didn't want it.
Wouldn't you know it I commited to a D/Max and today diesel prices skyrocket.
Merle

[20050420|7|006071|000022|69.19.2.78]

Merle,

about the diesel prices,

you can alwais put an 2.73 ratio in it :D

[REDTRUCK05]

Originally posted by mhagie:
I am about to purchase a 2001 D/A how do I find out if it has a 3:73 or 4:10 axle?
how about limited slip?
I am under the assumption there are codes that will tell this info,where do I find them? what are they?
Thanks in advance, Merle Call the nearest dealer give them the VIN and they should be able to give you the specs as it came from GM.

[redrider#1]

I have a related question. What is the difference between a limited slip and a locking differential? I only ask b/c I add a product called Power Up to all my vehicles, but it shouldn't be used in limited slip(may cause excessive slipping).

[DmaxMaverick]

Originally posted by redrider#1:
I have a related question. What is the difference between a limited slip and a locking differential? I only ask b/c I add a product called Power Up to all my vehicles, but it shouldn't be used in limited slip(may cause excessive slipping). A limited slip has clutches that are engaged all the time between the left/right axles, in the carrier. It will allow torque to be shared between the axles, but is limited to the amount of friction in the clutches. Additives are required to prevent clutch chatter, which is the clutches rapidly grabbing and releasing while in a turn, for example.

A locker is generally an open diff with a mechanical method of locking the axles, like a spool. The method can be air, electric, hydraulic, or centrifical. The locker in '95+ GM vehicles is a centrifical locker type. Prior model years had L/S. Lockers generally do not require additives (friction modifiers), and usually are not effected by synthetic lube. The 2001-current 2500HD's and up have an Eaton Gov-Loc locker, and come from the manufacturer filled with synthetic. Lower capacity vehicles have a similar locker, but I'm not certain of the factory fill.

Answer your question?

[redrider#1]

Thanks, dmax.