MrEarl Posted May 16, 2012 Share Posted May 16, 2012 (edited) Leif and I have been trying to complete the list of Dynaflow transmission code numbers for some time. The following letters are stamped on an aluminum plate low on the transmission (not always in the same exact place) on the left side between the main transmission case and the front pump housing. If anyone discovers a new letter that isn't listed here, please let us know what it is and what car the tranny is in. A picture would be great. H = '53 40 seriesJ = '53 50,70 seriesK = '54 40 seriesL = '54 50,70 seriesM = '54 60,100 seriesO = '55 40,60 seriesP = '56 AllR = '57 AllS = '58 AllT = '55 50,70 seriesW = '59 AllEdit) The above letters should be of help in matching up which transmissions came in which series and of what years AS THEY CAME FROM THE FACTORY. Because the part on which the letters are stamped are sometimes interchangeable between different series, they can not be considered as unequivically correct or absolute. Edited May 18, 2012 by MrEarl (see edit history) 1 Link to comment Share on other sites More sharing options...
sean1997 Posted May 16, 2012 Share Posted May 16, 2012 (edited) I have a similar table that I've been working on, see the attached file.(Note: this table is in a Word document, but I saved it as a PDF since we can't post Word files.)Dynaflow Codes.pdf Edited June 6, 2012 by sean1997 (see edit history) 1 Link to comment Share on other sites More sharing options...
Guest shadetree77 Posted May 16, 2012 Share Posted May 16, 2012 (edited) Lamar, I know my '52 Dynaflow has some numbers/letters stamped on it like that. I cleaned it off to look at them when I was under there putting the pan back on. I don't know what they are off-hand and it seems I didn't take any pictures of it, but I know they are there. Edited May 16, 2012 by shadetree77 (see edit history) Link to comment Share on other sites More sharing options...
Leif Holmberg Posted May 16, 2012 Share Posted May 16, 2012 sean1997,That was a good sourse for Dynaflow identitet.I hope somone will put the right letter i.d.for 1955 ser.40-60. Even this PDF are not sure about 1955s Dynaflow. Leif in Sweden. Link to comment Share on other sites More sharing options...
MrEarl Posted May 16, 2012 Author Share Posted May 16, 2012 I have a similar table that I've been working on, see the attached file.Good work Sean. Thanks for sharing. Link to comment Share on other sites More sharing options...
MrEarl Posted May 16, 2012 Author Share Posted May 16, 2012 Jeeeze, I just remembered, I have a 55 Special already jacked up in the air. will get under it tonight and check the letter. Link to comment Share on other sites More sharing options...
Leif Holmberg Posted May 16, 2012 Share Posted May 16, 2012 LAMAR,some people seem to have to many cars??????????? Leif in Sweden Link to comment Share on other sites More sharing options...
buick5563 Posted May 16, 2012 Share Posted May 16, 2012 (edited) Too many cars? I just happen to have four small series 55 Dynaflows in my garage right now. IF the letter you are looking for is on the drivers side, and it is mixed in with numbers, the letter is (drumroll):"O"The passenger side has a single letter (all alone) on only two of these transmissions. One trans is stamped "S", and one is stamped "T". Not sure what that means.One of the trans that had only that piece replaced was machined clean, so it IS possible that there will be no number. Edited May 16, 2012 by buick5563 (see edit history) Link to comment Share on other sites More sharing options...
Leif Holmberg Posted May 16, 2012 Share Posted May 16, 2012 (edited) This`s how the T looks on my 1955 50-70 ser.Maybe you will find the letter on 2 places.? Just wonder how they vere thinking when they put the code letters,not in alfabetic order.? Buick 5563 I hope your help will be what we are searching for.Thanks. Leif in Sweden. Edited May 16, 2012 by Leif Holmberg (see edit history) Link to comment Share on other sites More sharing options...
old-tank Posted May 16, 2012 Share Posted May 16, 2012 The part that has the code numbers/letter is not series specific in 55. Two are listed for 55 depending on whether bushing or bearing was used on the input shaft. Also if ever rebuilt who knows what parts were mixed.Willie Link to comment Share on other sites More sharing options...
sean1997 Posted May 16, 2012 Share Posted May 16, 2012 I think the second picture in Leif's post above shows the location of the ID number. Here is a picture from the '52 chassis manual: Link to comment Share on other sites More sharing options...
buick5563 Posted May 16, 2012 Share Posted May 16, 2012 Where your trans (bottom side) says T-77 one of mine says O-46.Another in the same spot says O183, and a third says O280I only have one DF out of my car now, but where your pic on top of trans says 19T5, mine has a diamond with 38 inside. Another IN a car has that same diamond. I had to find that with a mirror and flashlight. Since it is installed, I can't see what the number says. I will post some pics when I get a chance. Link to comment Share on other sites More sharing options...
Leif Holmberg Posted May 16, 2012 Share Posted May 16, 2012 The Dynaflow identification in my Shop Manual for 1956 show the same place as in 52 Chassies Manual from "sean1997". Leif in Sweden. Link to comment Share on other sites More sharing options...
MrEarl Posted May 17, 2012 Author Share Posted May 17, 2012 I have a 55 Special that has the O letter . See picture belowAlso checked another large body (Super) and it has the T. Too dark for a picture by then. Link to comment Share on other sites More sharing options...
buick5563 Posted May 17, 2012 Share Posted May 17, 2012 There you have it boys... Link to comment Share on other sites More sharing options...
MrEarl Posted May 17, 2012 Author Share Posted May 17, 2012 After crawling under several cars, digging through parts books, Product Service Bulletins and Buick Parts Product Information sheets, I feel confident enough to list the following 1954 letters as being correct. K = '54 40 seriesL = '54 50,70 seriesM = '54 60,100 seriesWillie, if you could share more on what you know about the fact that these letters are not series specific in 55 I'd like to add that info to the above list for clarification. Link to comment Share on other sites More sharing options...
Leif Holmberg Posted May 17, 2012 Share Posted May 17, 2012 This PDF from sean1997 will help to identifie from 1948 I think.Just hope the year and letters are right too. I think a lot of "dynaflow"buyer" and also "seller" will be helped by those Dynaflow indentityfie lists. See Mr Earls list too. Leif in Sweden.http://forums.aaca.org/attachments/f162/129818d1337138312-dynaflow-code-letters-1953-59-dynaflow-codes.pdf Link to comment Share on other sites More sharing options...
sean1997 Posted May 17, 2012 Share Posted May 17, 2012 (edited) The numbers in my table for 1948-1950 come from the "1948-49-50 Dynaflow Transmission Shop Manual" and the numbers for 1951 and 1952 are from the shop manual for each year. I couldn't find the same information in the shop manuals for other years, but maybe I didn't look in the right section. I have attached pictures for 1948-1952. I will update my table and re-print the PDF, but I would like to hear about 1955 first. What about later years, like 1960-1963, they must have had codes too? I've also attached some info from the 1960-1961 product service bulletins showing the differences between the years for the Dynaflow. Edited April 20, 2015 by sean1997 Added new pictures (see edit history) 1 Link to comment Share on other sites More sharing options...
old-tank Posted May 17, 2012 Share Posted May 17, 2012 Willie, if you could share more on what you know about the fact that these letters are not series specific in 55 I'd like to add that info to the above list for clarification.The part on which the numbers are stamped is called "converter reaction shaft and flange" group 4.226; two parts are listed:1166140 used with input shaft bushing1170321 used with input shaft needle bearingThere is no series designation...these parts could be installed in any 1955 dynaflow along with the appropriate input shaft. All of these codes could be useful in determining the year and series if nothing has been swapped around.Willie Link to comment Share on other sites More sharing options...
Leif Holmberg Posted May 17, 2012 Share Posted May 17, 2012 (edited) I`m sure they have,we have to wait and see if any owner are interrested to take a look on there 1960-1963 Buick.I don`t think the letter in the Shop Manual for each year tells the right letter ID ,in my 1956 Shop Manual the letter ID is K and that`s not right for 1956. Leif in Sweden. Edited May 17, 2012 by Leif Holmberg (see edit history) Link to comment Share on other sites More sharing options...
sean1997 Posted May 17, 2012 Share Posted May 17, 2012 I`m sure they have,we have to wait and see if any owner are interrested to take a look on there 1960-1963 Buick.I don`t think the letter in the Shop Manual for each year tells the right letter ID ,in my 1956 Shop Manual the letter ID is K and that`s not right for 1956.Leif in Sweden.The numbers I used are from the text, not the picutures. As you note, the numbers in the pictures are not correct. Buick seams to have reused the same picture in the manual without updating it with the correct numbers for each year. Link to comment Share on other sites More sharing options...
Buick Bruce Posted July 7, 2012 Share Posted July 7, 2012 Well, the tranny I had hoped to use for my 53 Roadmaster failed the front pump pressure check. It was one of those 'rebuilt 8 years ago, but never used' deals that I've had sitting for another 3 years. And it was only $50, so worth the risk. It was dry, and I finally got the pump primed by using a trigger-nozzle oil can with a fuel line hose and brass barb in the pressure port, but I only get 20 lbs in neutral.Thanks to this thread, I've been able to guesstimate the applications for in my Dynaflow Dungeon inventory:1. code J 100 - now in the car and believed to be original (this one was d.o.a. when I got the car 25 years ago) Bell housing 18184992. code H 287 - the one I tested. Seller had stored this for a Skylark project, but with the H code, it must be a 53 Super? It does have the 53 style cooler. Bell housing 1818499-13. code L 013 - been kicking around over 10 years, it was another 'rebuild' that was dropped during install. Torque ball flange is broken. I'm assuming this is a 1954 for 322. Bell housing 1163913-24. code 0 140 - also a long timer, it's a dirty used tranny - with a stator switch. I'm assuming this is a 1955 for 322. Bell housing 1163913-35. code A037 - dirty used tranny with stator switch, aluminum bell housing (couldn't find casting #), longer tail housing. Must be around 1960 vintage?It would seem the first four are all for 322 - they all have the same overall dimensions. I guess I'll next go for a pressure test of the 1954 unit - if it's ok, I can change the tail housing.If anyone has other suggestions for me to check for low front pump pressure, I'd appreciate it. However, if I have to take one apart, I'm inclined to try using the 1955 with some kind of little left foot button on the floor for the stator switch. That sound like fun! Link to comment Share on other sites More sharing options...
VickyBlue Posted July 8, 2012 Share Posted July 8, 2012 56 with P 095 here... Link to comment Share on other sites More sharing options...
Buick Bruce Posted July 9, 2012 Share Posted July 9, 2012 Very original, unmolested appearing car in long term storage:1953 Super with code J 172 Link to comment Share on other sites More sharing options...
CheezeMan Posted July 9, 2012 Share Posted July 9, 2012 I`m sure they have,we have to wait and see if any owner are interrested to take a look on there 1960-1963 Buick.I don`t think the letter in the Shop Manual for each year tells the right letter ID ,in my 1956 Shop Manual the letter ID is K and that`s not right for 1956. Leif in Sweden.My '63 Riv has J199 stamped on it... Hope that helps. Link to comment Share on other sites More sharing options...
buick man Posted April 9, 2013 Share Posted April 9, 2013 Just wanted to add to this thread and put a link here to one of my Dynaflow I.D. posts. Hope this will help to tie things together a little more by adding to the information base.http://forums.aaca.org/f162/what-application-year-dynaflow-transmission-348821.html Link to comment Share on other sites More sharing options...
TexasJohn55 Posted April 14, 2013 Share Posted April 14, 2013 (edited) 55 Special: short dynaflow, Code stamped on reaction flange is O (letter) 171, casting # on flange is 1166129 2, date code 4-55. Cast iron bell hsg 1163913-3. add this one to your database research. The assembly pn is 1166140 which uses a bushing in the reaction shaft, this pn is unique to the 55 but the casting # may or may not be. (I had previously incorrectly posted that the casting # was 1166140) TexasJohn55 Edited April 14, 2013 by TexasJohn55 (see edit history) Link to comment Share on other sites More sharing options...
TexasJohn55 Posted April 14, 2013 Share Posted April 14, 2013 I have a 55 Special that has the O letter . See picture belowAlso checked another large body (Super) and it has the T. Too dark for a picture by then. MrEarl, the trans coded 'T' does have a cast iron housing, doesn't it? Just curious and I know you already know, but it is so I will also know. Did you follow that? Thank you, TexasJohn55 Link to comment Share on other sites More sharing options...
MrEarl Posted April 14, 2013 Author Share Posted April 14, 2013 I think I followed it and yes it would be a cast iron housing as I "think" the 56 was the first year for an aluminum bell housing. Link to comment Share on other sites More sharing options...
Leif Holmberg Posted April 14, 2013 Share Posted April 14, 2013 (edited) Mr Earl is right.Leif in Sweden. Edited April 14, 2013 by Leif Holmberg (see edit history) Link to comment Share on other sites More sharing options...
Paul Falabella Posted April 14, 2013 Share Posted April 14, 2013 Mine is coded T-204. What's the 204? Link to comment Share on other sites More sharing options...
TexasJohn55 Posted April 14, 2013 Share Posted April 14, 2013 (edited) Mr Earl is right as he use to be.Leif in Sweden. Leif, that woul be "MrEarl is right as he usually is" or that he "used to be" which would infer that he no longer is correct. I am pretty sure that you meant the former...............To MrEarl,my understanding also.My question was in regards to my donor car having a 56 trans in it which I transplanted to my 55 Special and being 1 in too long. I'll not go over all that again,but that 56 trans has a T code on the reaction flange and there still does not seem to be a concensus on that application (in my mind). The contributors to this thread have been very helpful to my own understanding, expecially you and Willie, and I don't mean to slight those I did not name. TexasJohn55 ****CORRECTION! I RECHECKED THE CODE ON MY 56 TRANS AND IT IS INDEED A "P"(225) Edited April 17, 2013 by TexasJohn55 STUPID MISTAKE (see edit history) Link to comment Share on other sites More sharing options...
MrEarl Posted April 14, 2013 Author Share Posted April 14, 2013 Mine is coded T-204. What's the 204? Link to comment Share on other sites More sharing options...
MrEarl Posted April 14, 2013 Author Share Posted April 14, 2013 Mr Earl is right as he use to be.Leif in Sweden.Leif, that woul be "MrEarl is right as he usually is" or that he "used to be" which would infer that he no longer is correct. I am pretty sure that you meant the former...............TexasJohn55these days....who knows, I think both cases might apply..... Link to comment Share on other sites More sharing options...
TexasJohn55 Posted April 14, 2013 Share Posted April 14, 2013 these days....who knows, I think both cases might apply..... :) I can relate to that!! Oh! my apologies for leaving Leif off the list! TexasJohn55:) Link to comment Share on other sites More sharing options...
TexasJohn55 Posted April 14, 2013 Share Posted April 14, 2013 these days....who knows, I think both cases might apply..... :) I can relate to that!! Oh! my apologies for leaving Leif off the list! TexasJohn55:) Link to comment Share on other sites More sharing options...
Leif Holmberg Posted April 14, 2013 Share Posted April 14, 2013 TexasJohn55,I`m glad you corrected me,after all those years I have been written on the AACA Forum, I have been wondering why not peple have corected me before. I`m 71 and have never read English in my 7 year in school.Leif in Sweden. 1 Link to comment Share on other sites More sharing options...
Paul Falabella Posted April 14, 2013 Share Posted April 14, 2013 So T-204 would indicate the 204th day of production for the 55 model year run? Link to comment Share on other sites More sharing options...
TexasJohn55 Posted April 14, 2013 Share Posted April 14, 2013 (edited) Leif, my apologies to you. I am very impressed with your command of the English language. There are alot of "Americans" that don't do nearly as well! I have a rather blunt personality, not everything gets filtered through my brain. Some people find that abrasive and insensitive but it is not intended. I really intended it to be helpful. I really enjoy your posts, the comment was a cheap attempt at humor and I shall not do it again. My best regards, TexasJohn55 Edited April 14, 2013 by TexasJohn55 edited for spelling (see edit history) Link to comment Share on other sites More sharing options...
Paul Falabella Posted April 14, 2013 Share Posted April 14, 2013 Leif, you could be an English professor here in Brooklyn! Link to comment Share on other sites More sharing options...
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