Inspection of a 904 torqueflite

CudaFactHackJob said
I didn't say it wouldn't move if you pushed in on it. I can't comprehend how you can't understand that the driveshaft can never push the output shaft forward or it will destroy the transmission. The yoke must never bottom out on the output shaft; that's why there's plenty of room for it to slip in and out. You're a more trusting soul than me if you believe that that's a low gear set, the seller says it's 904 and purposely (I think) has left out pics of the front of the sun gear. In the seller's defense tho, I don't remember the ad stating that it was a low gear set. I could be wrong about that; I just don't want to bother looking at the ad again. I will wait for the op to post his progress before I post again. Maybe someone else can chime in on those two issues for you.

In an earlier post you said it does not move. The op and I have both verified that it can move a very slight amount that is enough to effect your input shaft reading. That is the point of this discussion.
I am sure you understand that as your rear suspension travels up and down that the driveshaft yoke slides in and out of the tail shaft.
I never said anything about the yoke bottoming out on the output shaft. I am just saying that when driving the car at speed and encountering to rough terrain the the extremely rapid sliding of the yoke would be enough to cause that slight movement in the output shaft to move forward. You want the tail shaft bearing snap ring to be the movement limiter and you want that limit to be reached before the output shaft drives the drums into the pump. That is probably the engineering reason for checking the input shaft end play or at least part of it.
You will note that when I posted the pic of the page where Allison says to stand it on end, he also has a different endplay tolerance recommendation. I have seen several areas of the Torqueflite where experienced builders have an alternate method that they consider to be more accurate. I have seen alternate recommendations on how to adjust bands that are not based on number of turns, but on the length of servo travel for example.
I have already agreed on the low gear set. Obviously I would verify what I was buying. I am going by the op picture which judging by the sunshell is a low gear set.