Tuner for larger tires

[LazyBoy]

Anyone know what’s the best tuner is to use when recalibrating speedometer to match larger tires? I am running a 6” RC lift with 35” tires. Any help is appreciated.

 

[MrDazana]

I did it with alfaodb. you'll need a security bypass cable.

 

[WR986]

I used Rough country. Also adjusted the trans shift point and ride control

 

[Scram1500]

Hypertech 752504

 

[UnclJim]

Been doin research here the last couple weeks the DT Tazer will do it also

 

[jjmcmanu]

Any other information or threads on this? I put 33" Cooper Discoverer AT3s with 2" level on my '19 Laramie longhorn and the shifts feel different. Not sure if it's just the heavier tires or if I need to recalibrate anything.

 

[Nick57]

Any other information or threads on this? I put 33" Cooper Discoverer AT3s with 2" level on my '19 Laramie longhorn and the shifts feel different. Not sure if it's just the heavier tires or if I need to recalibrate anything.

You shouldn't need one with that small of a jump from the factory 275/55r20 if that's what it came with. How ever if you want one I would recommend the TAZER DT. It's got some fun features on it and is close to the same price as most standard calibrators.

 

[Choate]

I did it and made the fogs stay on with high beams with jscan app for iPhone, a $30 OBD II reader and the security bypass cable. Total cost for everything was around $60. If you don’t want or need a lot of features and have an iPhone this is the way to go IMO. It’s exactly what I needed

 

[MoreOvalteenPlz]

If you plan on changing other BCM parameters in the future, I’d recommend using AlfaOBD. I used it to recalibrate the speedometer for LT275/65R20 Cooper AT3 XLT’s. My calculated circumference came out to 2672mm. The speedo reads spot on with GPS and causes no issues with the parking sensors.

 

[drafting1442]

Hey I still have my factory 20" wheels but put a different tire than factory. Now my Speedometer is off about 8-10%. Looking for something to fix this as my Ram dealer said they couldn't adjust it for me. Also would like one to do an mds delete with true dual exhaust.

 

[mplaramie]

JSCAN, AlphaOBD or Tazer DT are good options. With Jscan and AlphaOBD you need a cheap 12+8 Chrysler security cable and Bluetooth OBD reader.