Yet another 727 torqueflite end play question

[Neal Zimmerman]

I rebuilt a 727 for one of my cars and cant get end play on the input. I am absolutely sure I put it together right, but I'm wondering if it could be caused by mixing parts or using too much assembly lube.
I mixed and matched because no one transmission was purely in good enough shape to just rebuild , so some transplanting occurred. BUT I am aware of all the little year specific do's and don'ts.
Also I was liberal with the assembly lube so I am wondering if that could actually be causing some grief.
Just to clarify: Is Input end play supposed to be checked with the tail housing on and output bearing locked into the snap ring, correct?
I have the tranny in a trans fixture mounted to my engine stand. I have not done the "stand it on its tail shaft" trick I hear about. My book I'm working from ( Munroe) doesn't mention that nor does the service manual.

 

[Neal Zimmerman]

I rebuilt a 727 for one of my cars and cant get end play on the input. I am absolutely sure I put it together right, but I'm wondering if it could be caused by mixing parts or using too much assembly lube.
I mixed and matched because no one transmission was purely in good enough shape to just rebuild , so some transplanting occurred. BUT I am aware of all the little year specific do's and don'ts.
Also I was liberal with the assembly lube so I am wondering if that could actually be causing some grief.
Just to clarify: Is Input end play supposed to be checked with the tail housing on and output bearing locked into the snap ring, correct?
I have the tranny in a trans fixture mounted to my engine stand. I have not done the "stand it on its tail shaft" trick I hear about. My book I'm working from ( Munroe) doesn't mention that nor does the service manual.

Forgot to mention I've gone back through it a couple times and monkeyed with different shims and thrust washers

 

[67Dart273]

There is zero chance, as heavy as all that is, that assembly lube is affecting end play enough to talk about

 

[71Demon540]

Are you having too much end play? Or not enough? When I use a lot of assembly lube, it will be hard to pick up the input shaft to check end play til after it breaks free from the lube, then it works fine. I do put the trans tailshaft on the ground with the tail housing in place. I have a bench mount that allows me to do that with no issue.

 

[oldkimmer]

Set in on the floor on the pan. Report back. Kim

 

[Neal Zimmerman]

Yes lots of lube. I have been wondering if this could be a suction problem. I'm going to take it all back apart this weekend and wipe out a lot of the lube and look things over real well. Try again.

 

[oldkimmer]

Show us some pics. Maybe we will see something. Kim

 

[Duster346]

This is a topic where you may get several different answers when it comes to checking endplay.

If the hard parts are mismatched from several different years that could very well be a problem as pump stator supports and input shafts changed 3 different times. Need to check if you have a 2 or 3 ring input shaft and the correct stator support for that input shaft.

As for checking endplay, there is always a bit of slop or wear in the output bearing snap ring and/or extension housing (where the snap ring rides) on these. That is why some people will push the output shaft forward before checking endplay. In a perfect world there would be no rear endplay and the total unit end play could be adjusted and set without a lot of hassle.