N
nearmiss
Guest
Hi All,
I just had the diff ratio changed in my LT4/6pd from 3.45 to 3.90. I love the way the car now feels, but unfortunately, my plan to use the Hypertech Powerprogrammer to change the speedo programming isn't going to work. There is no default programming ratio for 3.90. So, I need to change the programmed tire size to compensate, using something like 4.10 as the diff ratio. Has anyone out there done this for 3.90 gears and if so, do you remember what you used for tire diameter to compensate? Thanks!
I just had the diff ratio changed in my LT4/6pd from 3.45 to 3.90. I love the way the car now feels, but unfortunately, my plan to use the Hypertech Powerprogrammer to change the speedo programming isn't going to work. There is no default programming ratio for 3.90. So, I need to change the programmed tire size to compensate, using something like 4.10 as the diff ratio. Has anyone out there done this for 3.90 gears and if so, do you remember what you used for tire diameter to compensate? Thanks!
