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Front axle?

Mike's 2500HD

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Mike's 2500HD Enthusiast

Mike's 2500HD

Posted
Posted

I am kinda new to this site...I just picked up a 2001 GMC 2500HD ext cab 4x4.

I got pretty lucky...the truck only had 18800 miles on it when I got it. It has a 6.0 liter with an automatic. The previous owner put duel flowmaster on it and a set of 285/75/16's on it. I have just ordered a set of GM "green" keys for it to fix the slight tire rub that I get when backing up and to fix the horrible rake it has going on. This is my first GM product...so I seem to be learning as I go. My wife just happened to talk me in to it. I have to say that I am pretty impressed with it so far. I just have a few questions:

 

1) Does anybody know what front axle is under these trucks? (I would really like to get a front posi or limited slip)

 

2) With all the different programmers out there now...are they really worth the money? (specifically hypertech or predator)

 

BTW...this is the best site I have seen so far when it comes to real experience and knowledge.

builderpaul Enthusiast

builderpaul

Posted
Posted

rear axle is full floating and could have the G80 locking option. There are no factory options for the front. (BTW posi and limited slip are the same thing)

 

Programers come and go. Hyper tech was popular last year. Westers was popular a few months ago but now I see some people complaining about them. Its a truck, a heavy HD with a 6L and oversize tires, wrong choice for someone wanting performace. If you want to feel more power than change back to the original 245 tires.

 

my 2 cents

Mike's 2500HD Enthusiast

Mike's 2500HD

Posted
  • Author
Posted

I realize where you are coming from about performance and the larger tire but, the larger tires seem to help out on our ranch. I plan on adding a better air intake system and some sort of programmer just to help when I am towing.

 

I looked up the rpo codes...it turns out that I do have the G80 code.

 

If anybody happens to know what the ring and pinion size is on the front axle of a 2001 GMC 2500HD with a 6 liter. I would greatly appreciate it.

Shaners Senior Enthusiast

Shaners

Posted
Posted

First off... Welcome to the forum!!! :eek:

 

I have the Westers PCM in my 6.0L and it really seemed to bring the truck to life. The stop light to stop light performance is much better, and the shift points are great. I haven't towed with the truck since the new install, so I don't know if it would improve also.

awdvkd Enthusiast

awdvkd

Posted
Posted

I'll second the Westers chip, it woke my 8.1 Allison up. It also helped the MPG. It sounds funny but it never got above 9 mpg and I now get 11- 11.5, it doesn't sound like much but that 20% increase. I figured it will pay for itself in a 1 yr to 1.5 yrs. I couldn't believe the difference. I do believe that some trucks seem to make better use of the advanced timing curves than others. Mine has never had any detonation problems to begin with. Larger tires do cut into performance greatly especially with the 6. liter. I noticed it a little with the 8.1 and 265's. Good Luck :eek:

BDBWTE Senior Enthusiast

BDBWTE

Posted
Posted

Your truck has IFS, independent front suspension, so it's not a axle by definition. The gear case is built by AAM, American Axle Manufacturing. I believe the ring gear is 9 1/4" not 100%. But with the 3/4 ton you can get a limited slip or a ARB, air locker for the front of your truck if your so inclined. Welcome to the forum.

 

BDBWTE

Chevyfreek Enthusiast

Chevyfreek

Posted
Posted

Welocme to the site! I have the 6.0L is my truck and the Westers PCM. The Westers made an incredible difference in the performance of my 6.0L and the way the 4L80E automatic transmission shifts as well. There are some lockers out there for the front diff. if you look around. Check out Eaton they provide the factory G80 locking differential for the HD's.... :eek::puke:

Mike's 2500HD Enthusiast

Mike's 2500HD

Posted
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Posted

I appriciate the info...

 

I have to say that I am really impressed with it so far. I used to lift trucks for a living before I joined the navy. I am pretty good at doing gear swaps but, the 4.10 gears seem to be doing just perfect with the 285's. I am just needing the lockers to get around on the ranch. I am going to check Westners and see what they can do for me.

 

Thanks again

:)

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