Transmission Question

[Longshot270]

Sounds good. You got real lucky they didn't do a reflash. It usually takes longer to program from stock than from another power level anyway.

[svt2205]

Thanks.

I've got to take the truck back to the dealer (leaking transfer case seal), so I'm returning to stock again. Just for comparison purposes. Oddly, when I returned to stock yesterday, I noticed that my speed now matches my GPS. I have 275/70-18's vs the stock 275/65-18's and it was always off before. Makes me think, the tech made an adjustment. I'm going to hook up my autotap software and see if the tire size is still listed at 650 rev/mile. If they tweeked the size, that might explain why it took longer to program from stock vs previous times I programmd from stock to custom.

Ah, who knows...

[Jackpine]

If your new tires are 275/70-18s, I'd expect the rev per mile value to be about 628. The 650 figure you stated is what I'd expect to see for your stock 275/65-18s.

But actually, the Gryphon expects you to enter the Tire Size as a circumference in millimeters, and your new TS should be close to 2560mm. If you have a new CS or CTS, you enter the diameter in inches, which would be 32.1" for your new feet.

- Jack