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I'm pretty sure it doesn't actually recalibrate the speedometer it just changes the wheel speed sensor inputs to the computer. The truck still thinks it has stock tires. -
By asilverblazer · Posted
I apologize, I missed this post, at risk of going off CURRENT TOPIC. I'm not saying it is BS, I'm questioning how much information is being held back. GM is NOT going to spell out exactly every parameter in the algorithm. Liability, intellectual property, etc. I'm not naive enough to believe that it is as simple as revolutions, coolant temperature, miles, time; are you? I don't do irrational either, and boiling the OLM down to four simple values that I could code in an afternoon (I'm not a coder) is irrational - unless it suits your agenda to ignore it. -
Chris 21 I appreciate your constructive response. !! 😉😉😉 The 6.6 is gas. Correct me if I’m wrong but by recalibrating the speedo you’re correcting the shift points of the transmission on these trucks.?. -
That is a huge misconception. Bigger does not always equal safer. Modifying does not make it safer either, with exceptions. Think of this. Your truck in stock form is capable of emergency maneuvers, proper stopping distances, its handling is designed around the factory wheel/tire packages, etc. 37s and a lift? Now you've affected your braking distances, handling and ride control. You've raised your center of gravity higher. Your front visibility is now obstructed more than stock, same for your rear. Does it look cooler? Yes. Does it now work as good as it did from factory on road? NO. As for my mention of exceptions? Say you had a sedan or crossover. They typically come with all season tires. If you swap out for a performance all season or a summer tire, you improve your car by lowering its stopping distance (better braking because of traction) and improve the handling (regular and emergency) of the vehicle. That is an actually improving modification. My old 2019 LD 1500, I ran UHP all season tires on 20in wheels in a factory offered size. It improved all aspects of how it drove over the Duratracs it came with from the factory in the stock 18" tire. -
37's would probably fit with a 3" lift. GM only has two gear ratios for these trucks 3.73 for gas and 3.42 for diesel. And they can't be programmed for anything else at the moment. The rough country module just corrects the speedometer and odometer to adjust for tire size it's not a programming device. You haven't said if your truck is gas or diesel, but for a gas truck the 10L1000 with 3.73 gears has a lower final drive ratio than the 6L90 it replaced would if it were swapped to 4.10s. GM used the same 3.73 gearing in 6 speed gas trucks. I don't think you'll have any issue running 37's with the 10 speed other than the reduction in mpg and towing/weight capacity which is as much of a function of the lift as the tire size.
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