Same issue. '05 Rennie 4X4. Did OME lift & went to 245/75R16s from the OEM 235/70R16s. 235/70s run ~720 revs/mi. 245/75s run ~686 revs/mi. So Jeep now thinks it's going 5% slower than it actually is. Dealer attempted to change pinion ratio..., BUT they discovered, after numerous attempts, that...