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Initially the Allison 1000 was a 5 speed transmission, rated to handle up to 620 lb⋅ft (840 N⋅m) of torque. This rating has increased as the transmission was updated several times, to stand at 765 lb⋅ft (1,037 N⋅m) by 2011 in GM truck applications.
A unique triple-clutch assembly on a dedicated intermediate shaft, placed in the middle of the architecture, replaces two ordinary clutches and is the key for packaging the 10-speed unit into the same space as the previous transmission. [8]
A dual-clutch transmission (DCT, sometimes referred to as a twin-clutch transmission, or double-clutch transmission) uses two separate clutches for odd and even gear sets. [37] The design is often similar to two separate manual transmissions with their respective clutches contained within one housing, and working as one unit.
The "MN4" 4T40E is able to handle vehicles up to 4000 lb (1814 kg) GVWR. The final drive ratio can vary depending on the car's curb weight and engine power output. 3.91, 3.63, 3.29, 3.05, 3.69, and 3.42 are all of the available ratios used in the 4T40 (and 4T45) transmission; Made possible by using combinations selected from 3 different sprocket combinations (32/38, 35/35, 33/37) and 2 ...
Allison 1000 Series — 6-speed longitudinal automatic made by Allison Transmission; Saturn MP6/MP7 — 4-speed automatic developed by Saturn for use in the S-series from 1991 to 2002; VTi transmission — continuously variable transmission; Tremec M1L transmission — 8-speed Dual-Clutch made by Tremec for the Chevrolet Corvette C8
In December 2020, GM initiated a program to repair or replace 9T65 transmissions which were causing issues. Repairs were limited to external components only. [12] The program applied to vehicles that had less than 18,000 mi (29,000 km) and had been delivered within the past 18 months. [13]
Allison transmission families for the Bus Series include the 1000/2000 Series (B210, B220, B295), 3000 Series (B300 / B400), and 4000 Series (B500). [ 5 ] Within North America, Bus Series transmissions carry a "B" prefix to distinguish them from other vocational series transmissions manufactured by Allison.
6 Variable Force Solenoids · 1 for each clutch · 1 for TCC Torque converter clutch Variable Force Solenoid ECCC · 2 path · turbine damper Converter size 238 mm (9.37 in) 258 mm (10.16 in) Fluid type DEXRON High Performance ATF Fluid capacity 10.8 L (11.4 US qt) [a] 10.3 L (10.9 US qt) [b] Weight 80 kg (176 lb) [a] 98.9 kg (218 lb) [b]