Is my drive shaft too short?

d55dave said

You cannot tell simply by the picture as you have no idea how long that new slip yoke is. The only way to know is to unbolt the rear u joint and push the shaft all the way forward. With the car weight on the rear suspension (not with the differential hanging on the springs.......is it hanging in the pic?) The shaft should slide forward 1", or have 1" to slide back to seat the u joint.

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When the picture was taken I had the jack stands under the axle so the weight was on the suspension. The car is back on the tires for now as I'm doing work under the hood for now. I will get it back up on the stands in a couple of days to check how much slip yoke engagement I have on the trans output shaft. I do recall that the output shaft stuck out just a little past the end of the tail shaft seal boot.