General Motors transmissions
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(→Automatic transmissions) |
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<font size=“2”><b>TH425</b></font></p></td> | <font size=“2”><b>TH425</b></font></p></td> | ||
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| − | <font size=“2”> 3-speed 1966-'78 (electric passing gear - THM400 derivative) - GM E platform automobiles (Oldsmobile Toronado, Cadillac Eldorado 1967-78) incl. GMC motorhome</font></td> | + | <font size=“2”> 3-speed 1966-'78 (electric passing gear - THM400 derivative) - GM E platform automobiles (Oldsmobile Toronado, Cadillac Eldorado 1967-'78) incl. GMC motorhome</font></td> |
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<tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%"> | <tr><td bordercolorlight="#FFCCCC" bordercolordark="#800080" style="border-style: outset; " bgcolor="#FFF8DC" height="15" width="15%"> | ||
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They all have a variable pitch (angle of incidence) stator in the center of the torque converter that changes the torque multiplication when the angle is changed. This feature gave the trans the feel of having a 'passing gear' when the throttle was fully depressed- causing he engine RPM to rise by 500-800. This feature could be found in some of the later GM transmissions and was discontinued at the end of the 1970s. | They all have a variable pitch (angle of incidence) stator in the center of the torque converter that changes the torque multiplication when the angle is changed. This feature gave the trans the feel of having a 'passing gear' when the throttle was fully depressed- causing he engine RPM to rise by 500-800. This feature could be found in some of the later GM transmissions and was discontinued at the end of the 1970s. | ||
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| − | + | These transmissions were mounted behind the 315HP 348ci engine in full size Chevys (4500 lbs.) and survived. These are most like a present day hydraulic version of the AUDI/VW DSG dual clutch manual tranny in that more that one 'gear' is engaged at the same time: DSG- 2 gears, Turboglide- 3 gears. | |
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The Turboglide as well as most of the other GM automatics of the time were phased out in favor of the TH350 and TH400 to reduce complexity and cost and to improve performance and reliability/durability. | The Turboglide as well as most of the other GM automatics of the time were phased out in favor of the TH350 and TH400 to reduce complexity and cost and to improve performance and reliability/durability. | ||
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