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Old 04-12-2013, 11:31 AM
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T400, rear servo too tight?

Hello,

I have finished the rebuild of my T-400, all my clutch pack clearances and input shaft end play came out very good. My concern is that after the rear servo was installed, there is enough drag on the drum to prevent the output shaft from spinning while turning the input shaft (by hand). I can turn the input shaft by hand, it is tight, but it appears to be just the forward drum assembly rotating around its [stationary] clutches. I can turn the output shaft by hand but it is not exactly “free” spinning, there is drag.

Everything was soaked in ATF before it was installed however the transmission has yet to be filled with fluid. I have read in a couple other places that sometimes it is necessary to remove some material off the end of the servo apply pin, to back off the band. The servo did go together alright but it seemed to just seat barely enough to get the cap bolted on over it… in other words it didn’t seem there was much room for it to travel based on how far I was able to seat it. Is that normal?

Thank you.

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Old 04-13-2013, 05:02 PM
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sometimes during assembly process, the band will be bumped off center from it's proper location.

Did you air check the apply of the band during the assembly process?

Did you check the stroke of the piston? You can look down inside the trans during assemble process , apply air and see the servo pin move - push on the band.

The out put shaft will not spin freely. One direction spins easier than the other direction
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Old 04-13-2013, 05:42 PM
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Quote:
Originally Posted by Crosley View Post
sometimes during assembly process, the band will be bumped off center from it's proper location.

Did you air check the apply of the band during the assembly process?

Did you check the stroke of the piston? You can look down inside the trans during assemble process , apply air and see the servo pin move - push on the band.

The out put shaft will not spin freely. One direction spins easier than the other direction
Thanks for the reply.

The only thing I air checked during assembly was the plunger assembly that moves when you apply air through the center support bolt. Other than that I do not know where to apply air. Where are the other air hole locations?

Should the entire assembly be "free" enough such that when you turn the input shaft, the output shaft will turn also?

Thank You.
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