New for the 2011 heavy-duty trucks is an optional, highly integrated exhaust brake system. Both the fifth and sixth gears are overdrives (turning slower than engine speed), with a sixth-gear ratio of 0.62:1 – a feature since 2005.
The Allison 1000’s six-speed configuration also contributes to greater fuel economy, with lower engine speed on the highway. When not locked, the converter “slips,” using more engine power and, consequently, more fuel. Increased converter lock-up – the transmission’s torque converter is “locked” at the same speed as the engine more often.Upgraded controls, including torque-based variable main pressure for more precise pressure in different conditions.Optimized lube distribution throughout the transmission eliminates excess oil in spots to reduce spin loss.New, low-drag clutch packs help minimize spin loss.Hardware and controls improvements to reduce the transmission’s “spin loss,” which means more of the engine’s power is channeled to the wheels, allowing the vehicle to do more work with less energy:.The Allison 1000 enables greater fuel economy and greater capability through engineered upgrades that allow it to channel torque to the axles more efficiently. “The updated model builds on the commercial duty cycle and up-to-33,000-pound (14,968 kg) GCVW rating of the previous model, so it will handle the loads customers give it for years to come.” “The bottom line is the Allison 1000 is a commercial-quality transmission that has been tested in the field by more than a million heavy-duty pickup customers, in addition to the hundreds of thousands of commercial customers that use its sister transmission provided by Allison Transmission, Inc.,” said Cooney.
On chassis cab models, capabilities increase to a gross vehicle weight rating of up to 13,200 pounds (5,987 kg) and a gross combined weight rating of up to 27,500 pounds (12,473 kg) on dual-rear-wheel models. The changes enable the transmission to handle class-leading input torque and support the new heavy-duty pickups’ increased GVWR of up to 13,000 pounds (5,897 kg) and a maximum fifth-wheel trailering rating of 20,000 pounds (9,072 kg). Additionally, a new 4WD output housing is matched with the upgraded transfer case for 2011. To match the increased torque output of the new 6.6L Duramax diesel, engineers updated the Allison 1000 with structural improvements that include increased strength for the input and main housings, a new, higher-capacity torque converter and increased clutch and shaft torque capabilities. Customer-friendly maintenance, with easy-access filter.Cab warm-up mode, for more comfortable driving in cold climates.
#Duramax allison transmission driver#
Tow/haul mode improves towing performance and driver control on grades.Driver shift control with tap up/tap down range selection for greater driver control in certain driving conditions, such as towing on a steep grade.PTO delivers class leading 250 lb.-ft.
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