50ChevyFrank Posted January 18, 2021 Share Posted January 18, 2021 (edited) I know the Hydramatic trans was used in some military applications (M135 trucks), but was the Dynaflow trans ever used in any? Really, how tough or strong is an early Dynaflow? Does anyone know the input torque rating? Would it be suitable for a light truck? Thanks. Edited January 18, 2021 by 50ChevyFrank (see edit history) Link to comment Share on other sites More sharing options...
avgwarhawk Posted January 18, 2021 Share Posted January 18, 2021 (edited) The engineering was based in part on the Torqmatic, a transmission developed by GM’s Detroit Transmission division for the M-18 Hellcat tank destroyer in WWII.) Kelley and his team responded to this request by devising a heavy-duty semiautomatic torque converter transmission that was subsequently produced by Allison (then a GM division) under the trade name Torqmatic. The original Torqmatic 900T AFV transmission combined a six-element torque converter (a single impeller, three turbines, and two stators) with two hydraulically controlled planetary gearsets, providing three forward speeds and one reverse. The transmission still had to be shifted manually, but there was no need to de-clutch and little danger of missing a shift. Moreover, the torque converter alone provided a stall ratio of 4.8:1, so a useful amount of torque multiplication was available even in the direct-drive third gear. https://ateupwithmotor.com/terms-technology-definitions/hydramatic-history-part-2/view-all/ Edited January 18, 2021 by avgwarhawk (see edit history) 1 Link to comment Share on other sites More sharing options...
avgwarhawk Posted January 18, 2021 Share Posted January 18, 2021 The Dynaflow in my 60 moves 2 tons(the car itself) without issue. 445 ft/lb torque Also add that these cars pulled campers and boats with ease. I would suspect a light truck would be just fine with a Dynaflow. 1 2 Link to comment Share on other sites More sharing options...
50ChevyFrank Posted January 19, 2021 Author Share Posted January 19, 2021 Thanks. Link to comment Share on other sites More sharing options...
NTX5467 Posted January 22, 2021 Share Posted January 22, 2021 If needed, be sure to use an adequate transmission fluid cooler in front of the radiator! Probably a magnetic temp sensor on the trans oil pan, to monitor atf temp, keeping it below 270 degrees F, which is where atf starts to break down. If you're concerned about torque capacity, the '65 401 DFs would probably be better than the 1955 versions. NTX5467 Link to comment Share on other sites More sharing options...
Fr. Buick Posted January 22, 2021 Share Posted January 22, 2021 '63 was the last year for the Dynaflow. 1 Link to comment Share on other sites More sharing options...
50ChevyFrank Posted January 22, 2021 Author Share Posted January 22, 2021 Thanks again. Link to comment Share on other sites More sharing options...
EmTee Posted January 24, 2021 Share Posted January 24, 2021 Pre-'61 versions would employ a closed driveline (torque tube). 1 Link to comment Share on other sites More sharing options...
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