Mark Hatton Posted April 3, 2018 Share Posted April 3, 2018 I live in the UK and have a problem with the tranny on my 1948 model 56 Sedanet. It is a 3 speed manual RHD. I have had it for 10 years and the transmission always worked well, but was noisy. It never jumped out of gear, and changed gear fine, though a bit 'crunchy'. I took the tranny apart last August renewed all the bearings seals etc, and also the 1st/ reverse sliding gear (good secondhand) and 2nd/ 3rd sliding gear (new from Bob's). I also replaced the very worn UJ with a new one. Everything worked perfectly on the bench. Driving the car and changing through the gears, all the gears work perfectly except for 2nd gear. It does not want to go in at any speed and makes a loud grinding noise. If I stop the engine, engage 2nd gear and hold it in firmly on the column change, it will just about stay in, but always immediately jumps out on the over-run. My guess is that the problem is with the interface between the new 2nd/3rd sliding gear, and the mating surface on 2nd gear, as everything else works perfectly, and the tranny is generally much quieter than before. In an ideal world I would get another complete transmission, but as my car is RHD the selector shafts for the gears exit on the right side of the transmission, so all LHD cars have a different transmission shell. Would anyone know of, or have, a new 2nd gear? this would mean that the mating surfaces between the 2nd/3rd sliding gear and 2nd gear would then both be new. Has anyone any further ideas? I have toyed with the idea of fitting a completely different transmission, but the torque tube/UJ arrangement makes this difficult. I have actually had the transmission out twice since August, but there is no obvious cause for this problem Mark Hatton Link to comment Share on other sites More sharing options...
Pete Phillips Posted April 3, 2018 Share Posted April 3, 2018 I may have one, new. Will check. Link to comment Share on other sites More sharing options...
Pete Phillips Posted April 3, 2018 Share Posted April 3, 2018 Got one. New old stock, in the original Buick parts box, second speed gear, fits 1940-1952 Specials and Supers. $195 + postage. Have this one and one more, and then that's it. No more. Pete Phillips, BCA #7338 PO Box 1247 Leonard, Texas 75452 1 Link to comment Share on other sites More sharing options...
1939_Buick Posted April 3, 2018 Share Posted April 3, 2018 (edited) Did you do get the sychro's rebuilt? Can be rebuilt by http://nwtparts.com/ Are all the small circlips, spacers, retainers & washers correctly installed? Jumping out of gear can be effected by engine & torque tube rubber mounts. Edited April 3, 2018 by 1939_Buick (see edit history) 1 Link to comment Share on other sites More sharing options...
Pete Phillips Posted April 4, 2018 Share Posted April 4, 2018 1939_Buick is right. If your motor mounts and transmission mount are deteriorated, that could be part of the problem. Link to comment Share on other sites More sharing options...
Mark Hatton Posted April 4, 2018 Author Share Posted April 4, 2018 Both these replies are helpful, and thanks for making the effort to respond so quickly and with images! I Have renewed the engine & tranny mounts about 18 months ago, so I don't believe these are affecting the gearchange, as I have done 2000 miles since then, no problems. I have put the large flat rubber insulators under the rear springs (which were missing), but can't see this altering things transmission-wise.. I was very careful to put it all back in the right order (twice!), so don't think I left anything out. I shall check this even more carefully when I take it out again. I would like to buy the second gear from you, Pete. Can we liaise by e-mail so that I can make the arrangements to pay you etc? I am at mpchatton@gmail.com Alternatively I could call you if you let me have your number. I might be interested in any other new tranny bits you might have. Mark Link to comment Share on other sites More sharing options...
Mark Hatton Posted April 4, 2018 Author Share Posted April 4, 2018 I forgot to mention, I fitted two new syncro hubs, bought from Bob's. Link to comment Share on other sites More sharing options...
JohnD1956 Posted April 4, 2018 Share Posted April 4, 2018 On a 1966 Skylark Gran Sport i had, the flywheel was turned before putting in a new clutch. It was one time too many. It became too thin and a new clutch disc worked for a while but then the springs on the clutch disc would hit the heads of the bolts that held the flywheel on and the car was jumping out of gear on 2nd and 3rd. The damage was seen on the springs of the clutch and a new flywheel solved the problem. Link to comment Share on other sites More sharing options...
jackofalltrades70 Posted April 4, 2018 Share Posted April 4, 2018 (edited) Mark Look in my thread about my tranny. A video was posted about your series of transmission that may help. http://forums.aaca.org/topic/304554-1947-transmission-service-manual/ Matt Edited April 4, 2018 by jackofalltrades70 (see edit history) Link to comment Share on other sites More sharing options...
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