727 yoke id question

I have noticed some small differences in yokes but it's usually not a lot. I have 2 laying here and one has 5" of splines and the other has 5-3/8" of splines. In each case they both bottom out at approx. the same depth but since there can be a difference in your yoke compared to mine it's best to slip the yoke you plan on using in the trans. all the way then slide it back out 7/8"~1" then measure how long the driveshaft has to be (center to center of the trans. yoke U-joint centerline to the rearend yoke u-joint centerline) and have it made to that dimension.