Driveshaft length using 1350 transmission and pinion yoke?

Newbomb Turk said
I bottom the slip yoke on the output shaft, pull it out 3/4-7/8 and measure.

I also don’t use the long seal on the tail housing. Never found the need to cover the slip yoke if it’s not out a mile.

You want the most spline engagement you can get. That means bottom it out, get it where you want it and measure.
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That's full engagement you have; no doubt. I have the seal installed so different expectations. All my measurements come back to 48.625 inches. That's with yoke 2 inches from tail of transmission. Wish someone could confirm the 48.625 driveshaft length. Thanks for your comment.