Shorten a driveshaft

[Ken/Alabama]

I’m shortening a 33-34 torque tube and driveshaft for a customers 32. Torque tube is already cut to 53 1/2” total length. With the torque tube standing on its end it measures 50 7/8” from the floor to the center of the speedometer gear window. I’m thinking that the important measurement for the driveshaft has to be from the pin hole at the pinion to the center of the speedometer gear but I put the pinion in the driveshaft and temporary pinned it then measured from the leading edge of the double cup pinion bearing race up to where the front stub shaft should be to give me 50 7/8” to the center of the speedometer gear. Is there anything I’m missing here before I cut the tube ?