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They can set certain tire sizes with the DRB. Although I remeber reading a thread on here about them not doing it for way oversized tires. Call your local stealer and find out what they can do.
Depends on what size tire you are going to. When my son put 305/16 on his they could not go that big. He's got the 295/75 16 now and last I heard thats still too big. His speedometer is aroung 8-10 mphs off.
I installed the Super Lift TruSpeed box and I love it. It has a switch so you can dial in two different settings for differents tire sizes. You can adjust it an infinite number of times and it's easy to calibrate. I fine-tuned mine right while I was driving! Great product IMO!
I bought the Abbott ERA box from Janetty Racing for seriously less money. It works the same and I think it's actually the original electronic speedo correction device.
I paid $150 for the Abbott including shipping. One caveat; it only works as is with rear anti-lock brakes, not four wheel anti-lock brakes. Mine's worked flawlessly since install about 3 months ago.