Speed calibration options

[dutchman187]

I had 305/45 R22 AT tires put on last week and noticed at around 70 mph, the speedometer is off 2-3 mph. I called the local dealer and they said they can only calibrate the OEM offered sizes for my truck, and that isn't one. Discount Tire assured me the tires are fine for fitting the truck, but don't offer speedo recalibration. I've read some people on here do it themselves, but I'd really like to just have someone else do it. Another dealer 30 minutes from here said they can do it, but the estimate starts at 125 as a diagnostic charge apparently.

Any other shops people recommend that do this?

 

[Idahoktm]

Your dealer can do it but it sounds like they're incompetent or just lazy. The cost would be at least $130 for them to do it, so why not spend less than $100 and do it yourself with AlfaOBD? I just did mine and after watching this video, it was really easy. https://5thgenrams.com/community/threads/best-speedometer-recalibration-tool.26739/post-488757

 

[dutchman187]

Your dealer can do it but it sounds like they're incompetent or just lazy. The cost would be at least $130 for them to do it, so why not spend less than $100 and do it yourself with AlfaOBD? I just did mine and after watching this video, it was really easy. https://5thgenrams.com/community/threads/best-speedometer-recalibration-tool.26739/post-488757

Question, if you do it yourself does it affect warranty in any capacity?

 

[Idahoktm]

Question, if you do it yourself does it affect warranty in any capacity?

I can't imagine how it would. All you are doing is telling the BCM that your tires are bigger.

 

[PaulieWalnutz]

I had 305/45 R22 AT tires put on last week and noticed at around 70 mph, the speedometer is off 2-3 mph. I called the local dealer and they said they can only calibrate the OEM offered sizes for my truck, and that isn't one. Discount Tire assured me the tires are fine for fitting the truck, but don't offer speedo recalibration. I've read some people on here do it themselves, but I'd really like to just have someone else do it. Another dealer 30 minutes from here said they can do it, but the estimate starts at 125 as a diagnostic charge apparently.

Any other shops people recommend that do this?

Did you go with Toyo at3?

 

[dutchman187]

Did you go with Toyo at3?

I went with Hankook Dynapro AT2

 

[Scram1500]

Question, if you do it yourself does it affect warranty in any capacity?

Possibly, but probably not. I used a Hypertech and the instructions say to unmarry and reset to OEM specifications before bringing it in for service. They indicate that if the dealer comes across settings in the computer that are not OEM it could raise a red flag. There was an active thread here where a dealership denied warranty coverage on a transmission due to a Tazer being left plugged in