Will only fit MX5 and MX6 mowersthat use a gearbox that uses a castle nut to mount the blade carrier, will not fit models that use a bolt to mount the blade carrier 1-3/8" Diameter by 21 Spline Input Shaft and a 1.97" by 15 spline output shaft Bolt Pattern (4) 3/4" Mounting Holes on a 8" Bolt Circle Gear Ratio 1:1.71 Speed Up Output Shaft Length from base flange is 7.85" Shipped Dry please add 80-90W gear lube before using One complete gearbox that is a compatible replacement for a John Deere Code AFH216263 gearbox used on later models for their MX5 and MX6 Mowers. This version of the gearbox used a castle nut and cotter pin to hold on the blade carrier. if your mower has a bolt mounting the blade carrier this gearbox will not work. The correct gearbox for mowers with a bolt holding the blade4 carrier can be found in our Amazon store. This gearbox features a 1:1.71 Speed Up gear ratio whicj exactly matches the original gearboxes and features high speed tapered roller bearings and heat treated gears and shafts. *Housing construction: Ductile iron *21 splines input shaft: 1-3/8 in. *Output shaft 2 in. 15 Spline *Gear type: Bevel gear *Bolt pattern: (4) 3/4" diameter holes on an 8 in. bolt circle *Gear ratio: 1:1.71 *Input Shaft center to the base flange is 7.06" *Output shaft length from the base flange is 7.85 *Shipped dry, please add 80-90W gear lube before using *Weight: 70lbs