Speedometer calibration with different tires?

[Retiredwarhorses]

I just want to buy a replacement.

that panal is utterly worthless....you will want it gone after the 5 ot 6th time you have to remove it for doing anything on that side of the truck. The way it’s attached to the throttle lock makes it an absolute PITA to install quickly

 

[cg25713]

Thank. You're right. I'll think about it.

 

[CallMeColt]

Just wanted to add my experience... my truck was showing speedometer fast. Had the newer 80mph. It was off by 5-10mph depending on actual speed. Swapped to a 41 tooth gear and it is perfect now. Bother were red, so going by color didn't seem to matter. If I were to overlay a 60mph speedometer on there, it would have been perfect. I think when the truck referbished in 2012 & got an A2 driveline, they didn't think to change that gear out. Pretty simple fix.