Posted 2/16/2019 21:08 (#7325514 - in reply to #7325268) Subject: RE: How much speed will I gain with a “double over” transmission?
Glad Valley SD
Most overdrive transmissions are a .86 ratio, so 3.73 rears 11r22.5 (41.4" diameter) tires and 1650 rpms would result in 63.38 mph. Most double over transmissions are .74 ratio, all other specs being the same would result in 73.66 mph. Just for reference a direct drive tans 1:1 ratio would result in 54.5 mph. So with a 13spd double over your top three gears would be 54.5, 63.38, and 73.66 at 1650 rpms.