Oldtech Posted November 8, 2020 Share Posted November 8, 2020 Took apart a 55 Olds Hydramatic that was rebuilt and hasn't worked right since. The rear clutch has about 1/8 inch of play in the clutch pack which looks like way too much to me. Does anyone know what the spec is? My books don't seem to have one. It has 8 fiber plates and 8 steels. 1 Link to comment Share on other sites More sharing options...
PFindlay Posted November 8, 2020 Share Posted November 8, 2020 There is an excellent series of videos on the early Hydramatic at this link: https://www.youtube.com/watch?v=ygkRuwCpKxU It's long (4 parts) but very informative. Link to comment Share on other sites More sharing options...
PFindlay Posted November 8, 2020 Share Posted November 8, 2020 Here's a page from the 1946 Hydramatic Service Manual. It refers to a rear clutch thrust washer and gives sizes and part numbers. Link to comment Share on other sites More sharing options...
Oldtech Posted November 8, 2020 Author Share Posted November 8, 2020 (edited) Thanks but not it. It is the clutch pack itself that has too much slop - in my opinion. Needs another plate maybe? and Yes I have watched the entire John Kelly series. Really great as long as you have the patience. But even he says there is no spec on the clutch. The other clutch has maybe .050 clearance which looks right to me. The plates are new. Edited November 9, 2020 by Oldtech (see edit history) Link to comment Share on other sites More sharing options...
PONTIAC1953 Posted November 11, 2020 Share Posted November 11, 2020 sounds like one clutch plate and one steel plate too many, my 1955 pontiac slant pan hydra-matic shop manual says for the rear pack 7 clutches and 7 steel plates. Link to comment Share on other sites More sharing options...
Oldtech Posted November 11, 2020 Author Share Posted November 11, 2020 Ya Pontiac use 7 but Olds use 8 . My problem is it looks like it should have another one. Or it's the wrong piston. I don't think it should have .125 + clearance. I was hoping someone had met enough of these transmissions to know the possibilities. As I said in the first post. It was rebuilt... not by me, so I don't have any of the old parts, but never worked right. Shift into 3rd was bad, but none of the shifts seemed proper. I haven't looked at valve unit yet. Link to comment Share on other sites More sharing options...
PONTIAC1953 Posted November 12, 2020 Share Posted November 12, 2020 shift from 2nd to 3rd is known as the big shift, proper shift times should be 1 to 2 at 5-8 mph, 2 to 3 at 15-17 mph, and 3 to 4 at 23-25 mph with a light throttle, could be your throttle pressure setting is too high. Link to comment Share on other sites More sharing options...
Oldtech Posted November 12, 2020 Author Share Posted November 12, 2020 Thanks: Anything is possible on this one. Will check when it gets in a car. Link to comment Share on other sites More sharing options...
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