The item: Factory ring and pinion gear. 3:91 ratio
Fits a 741 case. 1 3/8" pinion shaft (straight shaft)
Shows no wear on the gears.
I had a set of 3:55 ratio gears to replace the 3:91.
Where I live, "Interstate" I-35 is 75 MPH (miles per hour) Most run at 85 MPH. So, the 3:91 is a bit too...