Here are the specs on the box:

*45 horse power gearbox

*Standard 1-3/8" smooth input shaft(where the pto shaft hooks on). The pto shaft is held on by a 1/2 shearbolt.

*length of the input shaft out of the gearbox is 3" long

*bolt hole pattern for mounting is on the corners, 4-3/4 center of hole to center of hole. It takes a 5/8" bolt.

*12 splined output shaft(where the blade carrier hooks up on the bottom)

*1-9/16 outside measurement over the output shaft splines- from the base of the output cap to the end of the splines is 2-3/4" long- overall length of the output shaft is 4-1/2" long.

*takes a 1" threaded castle nut and a carter key on the bottom of the output shaft to secure blade pan(NUT is included - - BLADE PAN IS NOT!!)

*overall height of the box from the top of the mower deck to the top of the box is 9-1/2"

This is a fairly heavy item (47 lbs.) so freight is not cheap, but we do not make anything off of freight, whatever ups charges us we charge you.