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Another speedometer calibration question - 2024 2500 model

aro

By aro
in Modifications, Wheels & Tires

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aro Enthusiast

aro

Posted
Posted (edited)

I put 34" tires on my new truck and now it's 4-5 mph off. From what I can see, the only thing that might work with the 2024 model is the Rough Country speedometer calibration. Can anyone confirm if it will work?

 

I would have liked a Pulse LT but apparently they don't have one for my model... which isn't great. I want to adjust the TPMS warning and I probably have no way of doing it. 

Edited by aro
  • aro changed the title to Another speedometer calibration question - 2024 2500 model
aro Enthusiast

aro

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Posted

I can answer my own question: No, it doesn't work with 2024 models. Hopefully in the future. It looks like for now I have to remember to adjust the speed in my head.

 

A few days ago I was driving about 10% over the speed limit, but I had forgotten to add a few additional miles to my speed. Sure enough, I saw a cop measuring the speed of traffic right in my direction. Exactly at that moment it dawned on me that I was more than 10% over the limit because of the tires. First a quick mental "F@$k!" and then resignation... Fortunately, he was after bigger fish. 

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  • 1 month later...
TrueBlue Enthusiast

TrueBlue

Posted
Posted (edited)

I hear you. I kept the wheels and tires from my 23 2.7L Turbo when I traded it for my 23 5.3L V8. They're 275/60R20's. The factory wheels and tires on my 5.3 were originally 255/70R17's, so there's now about a 3.7mph increase at 70mph with the bigger wheels. I set my cruise at 70 and know I'm probably safe, but that's at the trooper's discretion. But, it's so easy to find myself doing 75 on the speedo, and that would probably not be good if I'm clocked.

 

I asked the dealership about a recalibration and they said they don't do them, even with 22" wheels. Don't know if they were just blowing smoke or not, but I've learned to be aware of it, and careful.

Edited by TrueBlue
aro Enthusiast

aro

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27 minutes ago, TrueBlue said:

I hear you. I kept the wheels and tires from my 23 2.7L Turbo when I traded it for my 23 5.3L V8. They're 275/60R20's. The factory wheels and tires on my 5.3 were originally 255/70R17's, so there's now about a 3.7mph increase at 70mph with the bigger wheels. I set my cruise at 70 and know I'm probably safe, but that's at the trooper's discretion. But, it's so easy to find myself doing 75 on the speedo, and that would probably not be good if I'm clocked.

 

I asked the dealership about a recalibration and they said they don't do them, even with 22" wheels. Don't know if they were just blowing smoke or not, but I've learned to be aware of it, and careful.

 

You have a 2023? Not sure what model you have, but the Rough Country calibrator is supposed to work with 2023's.

 

I check regularly the Rough Country calibrator site in the hope that someday I'll see that 2024's were added to the list.

TrueBlue Enthusiast

TrueBlue

Posted
Posted

Yeah, '23. I'll check on the calibrator. I was hoping that Range would be able to figure out the '23 and up BCM so that I could defeat the DFM at the same time. No luck so far.

  • 1 year later...
rodney barnes New Member

rodney barnes

Posted
Posted

I just got off the phone with HyperTech support (800-352-3351). He said it’s the only Speedo recalibration tool for a 2022 through 2026 GM truck (Chevy or GMC). The part number is the inline HyperTech 77100 unit, currently $899.   it is the same unit sold by rough country and summit, etc...  corrects odometer and speedo along with Trans shift pints.  He said it does not require removal when taking your truck to a dealer for service because it is an inline and installs under the hood as per the install instructions. It takes about 30 minutes to install for anyone once the controller is updated and programed from a PC for the tires used on the truck.

newdude Senior Enthusiast

newdude

Posted
Posted
1 hour ago, rodney barnes said:

 He said it does not require removal when taking your truck to a dealer for service because it is an inline and installs under the hood as per the install instructions. It takes about 30 minutes to install for anyone once the controller is updated and programed from a PC for the tires used on the truck.

 

 

100% beg do differ being in the dealer environment.  Many devices like this end up on the data lines that GM uses to communicate between modules, and those lines are also important during vehicle programming.  They most definitely can and have interfered with vehicle programming for sure.  

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