Change the speedo gear in the transfer case.
Stock gear was 18 teeth.
stock diff 4.1
stock tire 225/75 15 = 28.3"
New gear would be
(old speedo gear) * (new diff gear) / (old diff gear) * (old tire diameter) / (new tire diameter) = (new speedo gear)
18 * 5.29 / 4.1 * 28.3 / 35 =
19
