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The third digit indicates differential type: 1 means locked (no differential), 2 means open, 3 means electric locked, 4 and 5 both indicate an asymmetrical torque split planetary gear and gear drive, 6 means an electronic clutch pack, 7 means a hydraulic clutch pack (except for the unique 207), and 9 means a viscous coupler.
1946–1953 M5/M6 Presto-Matic — 4-speed (2 gear manual with electric overdrive) with clutch and fluid coupling (Fluid Drive) or torque converter (Fluid Torque Drive); also known as Tip-Toe Shift, Gyro-Matic, Fluid-Matic, Gyro-Torque; 1953–1954 Hy-Drive — 3-speed manual transmission behind a torque converter
The M6 Presto-Matic was a Chrysler Corporation semi-automatic transmission produced from 1946 to 1953. It was a special manual transmission with a fluid coupling.Although it had just two forward gears, an electric overdrive unit was attached and useful in either gear for a total of four forward speeds.
The addition of a two-speed output shaft (overdrive unit) that is bolted to the back of the three-speed transmission has only two ratios: direct (1:1) and overdrive (.69:1). While lubrication to the overdrive unit was a challenge early on, this challenge was later overcome with factory improvements or aftermarket valve body kits.
Transmission overhauled with a refurbished clutch plate and new clutch cover, new clutch slave cylinder and clutch release bearing, missing clutch slave cylinder return spring reinstalled, new custom-made hydraulic pipe installed. Seized brakes refurbished by cleaning the brake discs and installing new brake pads. Clutch and brake fluids replaced.
The transmission uses a hydraulic clutch, except for the Cobra which was mechanical. The Cobra had an 11-inch clutch disc. The entire case, including the bell housing, is made of aluminum. The T-56 has a synchromesh made up of brass synchros for the GM and Ford applications, and stainless steel in the Dodge application.
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