$4,500 Mistake?

[BPinOC]

I own a 2005 Chevrolet Silverado 2500HD crewcab 4x4 with an 8.1L engine and Allison transmission.

 

I did all of the research and determined that if I put 34 inch tires on the truck (stock is 30.5), I would need to change the gear ratio in the differentials to 4.56 (stock is 3.73) to maintain the stock rpm's at driving speeds. I learned that the truck's computer could be re-programmed with all of the new component data, and that I'd be able to drive the truck with no ABS or speedometer problems after the re-programming.

 

Well, I spent $3,000.00 on the re-gearing and electric lockers, and $1,500.00 on the tires. I then took the truck to the dealer to have the computer re-programmed. The dealer told me they couldn't reprogram the truck's computer because the tires and gears were outside their "programmable parameters". However, they suggested the truck's computer could be reprogrammed by an after market re-programmer (e.g., Hypertech).

 

I went online to buy a Hypertech programmer and found that it doesn't allow programming of gears and tires if the truck has an Allison transmission! The same is true for the other programmers I found.

 

I've searched high and low online for a solution, but I can't find anything even close to my problem.

 

I'm desperate because my ABS warnings are going off like there's been an attack on U.S. soil by some foreign enemy. I don't want to burn anything up (especially the Allison Transmission), and I certainly don't want to spend $4,500 to put things back to stock.

 

I can't possibly be the first person to have encountered this. Does anyone know what I can do? I would especially appreciate help from those out there that have had this problem and somehow had it fixed.

 

Help!

[VMax2007]

www.blackbearperformance.com Ask for Justin or Jenna.

 

www.gowheatley.com Charlie

 

(see their banners on the left, they are site sponsors)

[BPinOC]

www.blackbearperformance.com Ask for Justin or Jenna.

 

www.gowheatley.com Charlie

 

(see their banners on the left, they are site sponsors)

 

Thanks a ton. They said they could help.

[uh6tdrvr]

id say they could REALLY wake up that 8.1L BBC! let us know how it runs when they get thru with it!

[zxcv]

id say they could REALLY wake up that 8.1L BBC! let us know how it runs when they get thru with it!

 

 

+1 !!!

 

 

That thing is going to be a MONSTER!

[Hulk1999]

I'm desperate because my ABS warnings are going off like there's been an attack on U.S. soil by some foreign enemy. I don't want to burn anything up (especially the Allison Transmission), and I certainly don't want to spend $4,500 to put things back to stock.

I

 

Help!

 

 

I see on wester's garage they have a cure for the ABS/brake light situation. My does the same thing since i changed my tire size. I haven't fixed it yet but it does not affect my braking performance.