[77newell]

Pete, I don't recall. You can calculate it by looking up the revolutions per mile by the tire manufacturer, since60mph=1 mile/minute, my transmission is 1:1 in 4th so by choosing the engine rpm you want you can determine the ratio. For instance an 11R22.5 tire rotates about 500 times a mile. So, at 60mph, or 1 mile per minute, the tire will rotate at 500rpm. If the engine is turning 2000rpm, with 1:1 transmission gearing, then the differential ratio would be 4:1. With the same tires and speed and an engine rpm of 1500 the gear ratio would be 3:1. For your proposed 3.55 ratio, at 60mph the engine would be turning 1775rpm.

Hope this helps.