I am rebuilding my a904 tranny and have encountered a problem. The pictures in the manual show a kickdown servo assembly with two springs, a small one and a large one. The servo in my tranny only has one. The small one, and a piston seems to be missing. Did I misplace a part? Or are there different servo's for different years?

Roelof

It sounds like your servo is fine and that the picture is for a servo from a 727. My book shows a second, relatively small spring and a washer with the note A-727 only. From outside (bottom) to the inside you should have a snap ring, piston rod guide with it's sealing ring, a snap ring, piston rod and the servo piston with 2 sealing rings.

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Joshua

...it does sound like something is missing.

This is all there is:





So is the piston missing?

The ATSG-guide I used for the rebuild is for the 727 and 904, so I figured some parts might not be exactly the same. That's why a photographed almost everything. And a forgot to take a picture of the servo when I took it out

It does appear the piston is missing. Are you sure it came out of the case?

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Joshua

...ehmm.

I knew I overlooked something. Now I know what these spare rings were for

Thanks

So the piston was still in the case? That's good because you wouldn't have 2nd gear without it.

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Joshua

I spent some time looking for a piston. The case was the only place i didn't look