11/18/2023 0 Comments Automatic 8 speedIt is designed for use in longitudinal engine applications either attached to the front-located engine 1 with a standard bell housing or in the rear of the car adjacent to the differential (as in the Corvette). The resulting smooth gear changes, which are among the world's quickest *, create a rhythmical and comfortable sensation that is suitable for a premium rear-wheel-drive vehicle. The 8L90 is an eight-speed automatic transmission built by General Motors. In the case of the Direct Shift-10AT, even though the number of gears has been increased to 10 (compared to eight gears in the case of the Direct Shift-8AT), the use of close-ratio gears optimizes the range of use of each gear, particularly in the low-to-mid speed range. The GM 8L90 and 8L45 transmissions were developed to replace earlier 6-speed automatic transmissions in General Motors rear wheel drive vehicles. The resulting quick and smooth response to accelerator pedal operation creates an "as desired" direct driving feel. TCI® 4x Four-Speed Auto Transmissions enable the use of a 4L80E transmission with non-GM applications.This 4L80E-based. And their lower center of gravity results in both improved straight-driving stability and better cornering stability.įurthermore, widened gears and a newly developed high-performance compact torque convertor combine for a broader gear lockup range. 4x Four-Speed Transmission for Chrysler Gen III Hemi, Electronic 4L80E-Based. Tracing its roots all the way back to the iconic 956 and 926 sports cars of the. The 8L90E from Chevrolet Performance is equipped with a slip-yoke design tail shaft. Porsche Automatic Transmission: 8-speed Porsche Doppelkupplung (PDK) Overview. The latter device, which regulates fluid flow into-and-through the transmission based on driving style, operates under two output levels low and. A numerically higher 4.56 first gear ratio offers strong take-off performance while a double-overdrive sixth gear ratio of 0.65:1 helps optimize cruising efficiency. The 2015 (and later) C7 Corvette’s eight-speed transmission, formally referred to as the 8L90E, was constructed of four gearsets, a pair of open clutches, and an industry-first binary-vane pump. The new automatic transmissions are more compact and lighter than comparative conventional transmissions, lowering a vehicle's fuel requirements. The 8L90E fits only the GEN V LT1, LT4 or LT5 engines. These and other efforts resulted in achieving one of the world's best transmission efficiencies*. Gear tooth surfaces were processed using a new technique for a lower coefficient of friction when the gears engage, and the configuration of the friction material used inside the clutch was optimized to reduce clutch torque loss by approximately 50 percent during rotation (compared to a conventional 6-speed transmission). Currently, GM offers two models of eight-speed transmissions, the light-duty 8L45 and heavy-duty 8L90. A year later, the 8L transmission series had spread out to the Corvette and trucks such as the Silverado and Yukon. By 2014 GM released the 8L90 in the Cadillac ATS. For both, various measures were taken to minimize energy loss and heighten transmission efficiency. GM 8L90 The Other 8 Speed Automatic: Part 2. Toyota has developed two new automatic transmissions―the 8-speed Direct Shift-8AT and the 10-speed Direct shift-10AT.
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