Chrysler 300C and Dodge Magnum R/T will be equipped with the first five-speed automatic transmission ever offered in a Chrysler Group passenger car -- Fully adaptive, electronic control of all shifting adapts to driving styles, driving situations and road conditions -- Transmission is efficient, compact and lightweight.
The Chrysler Group's first five-speed automatic transmission for passenger car provides a full range of transmission performance to match a great variety of driving styles, situations and road conditions. "This transmission offers Chrysler Group customers many benefits. The five-speed gear range provides a better balance of performance and fuel economy than a four-speed automatic transmission," said Eric Ridenour, Executive Vice President Product Development, Chrysler Group. "Fully adaptive electronic control of all shifting makes the powertrain feel responsive without harshness."
The transmission's physical attributes include compact size, robust design for high-torque rating and multiple features providing high efficiency. It also utilizes highly advanced electronic controls such as fully adaptive electronic control and Electronically Modulated Converter Clutch (EMCC).
This five-speed automatic transmission is standard equipment with the 5.7-liter HEMI(R) V-8 engine on the rear-wheel drive 2005 Chrysler 300C and Dodge Magnum R/T. It is a DaimlerChrysler transmission built at the Indiana Transmission Plant II in Kokomo, Indiana.
Performance and Fuel Economy
A broad ratio spread from First to the Fifth was selected to minimize fuel consumption and reduce powertrain noise during cruising. An aggressive First- gear ratio may provide excellent launch performance, and evenly spaced gear ratios can provide smooth acceleration through the gears.
Efficiency is achieved through physical and electronic means. This transmission uses bearings to reduce friction in many locations where other transmissions may utilize bushings. The transmission also uses a unique scavenging system that removes oil spun off of the rotating parts by centrifugal force through strategically placed slots in the outside of the case. This saves energy that would be consumed by internal parts rotating in oil. Lubricating holes in the clutches are also positioned to promote quick passage of the transmission fluid through the discs, minimizing viscous losses due to trapped oil.
The shift schedule adapts to individual driving style, driving situation and road conditions, altering shift points based on an accelerator pedal usage, brake usage, lateral acceleration, altitude and load on the car as a result of grades. Electronically controlled engine torque management provides quick wide-open-throttle up shifts and quick two-step (4-2 or 3-1) kick-down shifts that are smoother than would be otherwise possible without this feature.
The Transmission ratios are:
1st 2nd 3rd 4th 5th Reverse
3.58 2.19 1.41 1.00 0.83 3.17
Fully Adaptive Electronic Control
Fully adaptive electronic control of all shifting makes shifts very smooth. The system monitors the transmission as shifts occur and adjusts hydraulic pressure as needed. In so doing, the controls could make the powertrain feel responsive without harshness.
Driver recognition software alters shift points based on accelerator pedal usage, brake usage and lateral acceleration. This does not require a compromise between sporty and economical operation, nor is it a question of choosing one or the other.
Torque Management System
Torque management uses engine torque modeling to facilitate smooth transmission shifting. Because of electronic throttle control, torque management is more sophisticated and covers a broad torque range.
EMCC
Torque converter clutch slippage is electronically modulated and provides for partial engagement in Third, Fourth or Fifth gears. This results in improved shift feel, fuel economy, driveability and cooling. It can be used at lower speeds to provide benefits over a broad speed range. The system disengages as required to provide optimal performance.
