kscarbel2 Posted January 26, 2018 Share Posted January 26, 2018 Quote Link to comment Share on other sites More sharing options...
Red Horse Posted January 27, 2018 Share Posted January 27, 2018 And I thought Howie Long was bad! 1 Quote Link to comment Share on other sites More sharing options...
Hayseed Posted January 27, 2018 Share Posted January 27, 2018 They mention that one of the Semis had a "Powermatic" transmission, Would that've been a Beefed up automotive trans? or was Allison involved?? there was also mention of a "Hydraulic Retarder" Anyone know more about that?? I Guess i could google it.. But would rather hear from someone with some Knowledge on the Subject.. Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment Share on other sites More sharing options...
kscarbel2 Posted January 27, 2018 Author Share Posted January 27, 2018 6 hours ago, Hayseed said: They mention that one of the Semis had a "Powermatic" transmission, Would that've been a Beefed up automotive trans? or was Allison involved?? there was also mention of a "Hydraulic Retarder" Anyone know more about that?? I Guess i could google it.. But would rather hear from someone with some Knowledge on the Subject.. http://www.chevytalk.org/fusionbb/showtopic.php?tid/64343/ https://www.trifive.com/forums/showthread.php?t=79667 https://www.ebay.com/itm/1956-Chevrolet-truck-Powermatic-transmission-booklet-Disassembly-Assembly-/262249786113 1 Quote Link to comment Share on other sites More sharing options...
Red Horse Posted January 27, 2018 Share Posted January 27, 2018 2 hours ago, kscarbel2 said: http://www.chevytalk.org/fusionbb/showtopic.php?tid/64343/ https://www.trifive.com/forums/showthread.php?t=79667 https://www.ebay.com/itm/1956-Chevrolet-truck-Powermatic-transmission-booklet-Disassembly-Assembly-/262249786113 No clue on the hydraulic retarder but Ford in that era offered a "Transmatic" that I think was an Allison-my bet same transmission as used in the Chevy. 1 Quote Link to comment Share on other sites More sharing options...
Hayseed Posted January 27, 2018 Share Posted January 27, 2018 6 hours ago, Red Horse said: No clue on the hydraulic retarder but Ford in that era offered a "Transmatic" that I think was an Allison-my bet same transmission as used in the Chevy. According to the first link Kevin put up, It's an early 6 speed Allison... The Hydraulic retarder has Me intrigued, As the Only ones I've ever heard (& seen) have been European.. Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment Share on other sites More sharing options...
h67st Posted January 28, 2018 Share Posted January 28, 2018 The Cat Brakesaver was basically a hydraulic retarder; probably a similar design. It's like a torque convertor, but one of the pieces is stationary so it slows the engine/driveline. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted January 28, 2018 Share Posted January 28, 2018 Hydraulic retarder is a unit your output shaft goes through. When you wanna slow down it would open oil flow up and use oil movement as resistance. Quote Link to comment Share on other sites More sharing options...
kscarbel2 Posted January 28, 2018 Author Share Posted January 28, 2018 GM's hydraulic retarder is mentioned. 1 Quote Link to comment Share on other sites More sharing options...
kscarbel2 Posted January 28, 2018 Author Share Posted January 28, 2018 Related? Turboglide's selector quadrant was Park, Reverse, Neutral, Drive, Hill Retarder (early 1957 only) P R N D Hr[2] or Grade Retarder (late 1957-1961) P R N D Gr. Turboglide offered a 'Grade Retarder' range for providing engine braking when necessary, a driving condition which could absorb close to 200 hp (150 kW) of power above to what was available via the engine compression, by counter-rotating the turbines in the converter and soaking up the vehicle energy by agitating the oil inside the converter housing. No low range was provided with Turboglide, as in the Drive range the ratio was always automatically and perfectly matched to the requirements of the operator (all ranges being always engaged, low and intermediate would freewheel on the 'sprag-clutches' as needed), and with the Grade Retarder providing a very efficient engine brake. https://en.wikipedia.org/wiki/Turboglide Quote Link to comment Share on other sites More sharing options...
Hayseed Posted January 28, 2018 Share Posted January 28, 2018 There's mention of the Retarder here in the 1957-58 years notes.. Appears to be an Allison development.. https://www.gmheritagecenter.com/docs/gm-heritage-archive/historical-brochures/GMC/100_YR_GMC_HISTORY_MAR09.pdf 1 Quote "Be who you are and say what you feel...Because those that matter...don't mind...And those that mind....don't matter." - Link to comment Share on other sites More sharing options...
RoadwayR Posted January 28, 2018 Share Posted January 28, 2018 21 minutes ago, kscarbel2 said: Related? Turboglide's selector quadrant was Park, Reverse, Neutral, Drive, Hill Retarder (early 1957 only) P R N D Hr[2] or Grade Retarder (late 1957-1961) P R N D Gr. Turboglide offered a 'Grade Retarder' range for providing engine braking when necessary, a driving condition which could absorb close to 200 hp (150 kW) of power above to what was available via the engine compression, by counter-rotating the turbines in the converter and soaking up the vehicle energy by agitating the oil inside the converter housing. No low range was provided with Turboglide, as in the Drive range the ratio was always automatically and perfectly matched to the requirements of the operator (all ranges being always engaged, low and intermediate would freewheel on the 'sprag-clutches' as needed), and with the Grade Retarder providing a very efficient engine brake. https://en.wikipedia.org/wiki/Turboglide Yes, the retarder in old Allison transmissions functioned similarly. It was particularly effective in diesel trucks, as a diesel (before Jakes) provided little engine braking. 1 Quote Link to comment Share on other sites More sharing options...
41chevy Posted January 28, 2018 Share Posted January 28, 2018 (edited) The Powermatic was a late WWII design for the M18 Hell Cat tank destroyer and the M26 Pershing as the Torq-matic and built by GM's Detroit Transmission Division , all production was transferred to GM's Allison division in 1946. I should have one in one of my containers from our '53 GMC potato hauler from when I yanked the 320 six for my 55 bel air gasser years ago. Manual Valve body for gear selection. Bullet proof but weighs a ton. Edited January 28, 2018 by 41chevy 2 Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
Brocky Posted January 31, 2018 Share Posted January 31, 2018 In the summer of 1963 I worked in a truck garage outside Ithaca NY. Cornell University had an early 60's GMC single axle bulk milk tanker. Gas job with an automatic transmission, it had another fuel feed type peddle on the left side which said "retarder" on it. I was too young and dumb to know how it operated as I only drove it from the yard to over the pit to service it. Was this a mechanically operated application to something described above??? 1 Quote Brocky Link to comment Share on other sites More sharing options...
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