Transmission names use the number of gears, torque rating, Transverse/Longitudinal, and whether it has electronic control; so 42LE is a 4-speed, moderate-torque-capability, longitudinal-engine transmission, while 62TE is be a six-speed, same-capacity transmission for transverse mounted engines.
RE/RFE are rear wheel drive. Start with 845RE, the first is the number of forward gears, while the next two numbers are both the torque capacity in (Nm/10) — e.g. 450 Nm.
Randle Blankenship wrote: There was a time in the early to mid 1950s when GM Hydramatics were used in Nash, Hudson, Kaiser, Willys cars... and some Dodge postal delivery trucks (1954 or 1955 RHD models).
The Dodges had the shift lever sprouting from the left side of the steering column. The shift quadrant was marked R Lo Dr N. I can confirm that it was indeed a four speed truck Hydramatic coupled to a Dodge Six engine. The same vintage International postal trucks were using 3 speed Borg Warner automatics. I do not know of any consumer type Dodge truck of the time being offered with any kind of automatic, though some earlier Dodge pickups had optional fluid drive.
General Motors, DaimlerChrysler, and BMW developed a two-mode transmission/motor, which increased the gas mileage of the Dodge Durango/Chrysler Aspen Hemi by around 25%; it was also used in Chevrolet and Cadillac trucks and Mercedes and BMW cars. Starting in 2007, GM built all the transmissions for all the partners in a new plant near Baltimore. It had two electric motors inside; one for low speeds, the other for high speeds. The automatic-transmission part (which is used for transmitting gas-engine power) was a CVT. This setup was dropped by General Motors pickups when the 2014 models were launched, and by Chrysler when the Durango and Aspen were cancelled.
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