The only people who will see the skip-shift activate have to be driving like the proverbial “old lady.” At very light throttle, the computer will activate the solenoid in 1st gear, forcing the driver to shift from 1st to 4th, which shuts down the fuel in the engine-management system to prevent an over-rich condition. If you drive the vehicle at normal rates of acceleration or beyond, the skip-shift solenoid will not function. Since closed-throttle positions generate more pollution, the skip-shift solenoid was added to try to control throttle opening and shift position. Automatic transmissions shift at open-throttle position manual gearboxes always shift at closed throttle. This is an attempt to meet stricter environmental and pollution regulations. The other solenoid, on the transmission main case, is the “skip-shift” feature. During a shift to reverse, the solenoid will activate, overcoming the spring tension and allowing reverse to be reached with fingertip effort. spring load on the gate to keep the driver from catching reverse when making a shift to 5th. The shift pattern locates reverse to the right of the 5th-gear slot on the shifter. The reverse-lockout solenoid is by the shift tower. There are two solenoids on the transmission. This unit is specified to use synthetic ATF for lubricant. The shift forks are aluminum for 1-2 and 3-4, and reverse is synchronized for smoother engagement. The linings on the synchro rings were paper clutch material on early production units, and Tremec has upgraded that to carbon-fiber linings. The synchronizers are double-lined rings using steel inner and outer cones on 1st and 2nd gears. This transmission is available in several ratios:Įquipped with an aluminum case, extension housing and bellhousing, the T56 uses advanced synchronizer technology and a single-rail shift system. Ford uses the T56 in the Cobra R Mustangs and the later-model Mustangs, and Aston Martin uses a version of the T56 equipped with an extension housing that contains a number of shift solenoids to enable “paddle-shift” capability from the steering wheel. Chrysler uses the T56 behind its Dodge Viper V-10 and in the new sport pickup truck that uses the same engine. The General also used the T56 in the new Cadillac CTS-V performance model, which uses a Corvette Z06 engine and drivetrain, and in the new Pontiac GTO. It is the transmission used in the new generation of C6 Corvettes. This unit was mounted behind the driver and mated directly to the differential to give the ’Vette better balance and weight distribution. GM later had Tremec develop the T56 for use in the C5 generation of Corvettes. The T56 was used first in GM’s F-body Camaro and Firebird models behind the LT1 engine and later coupled to the LS1 and LS6 engines. As such, this unit offers opportunities for repairs in your shop and for performance upgrades that you can offer your customers to add to your profits. Tremec has taken the T56 to new levels of production and development, and this unit is now the six-speed of choice for many of the popular sports and performance vehicles on the road today. Tremec operates a world-class plant that is producing transmission products for many of the world’s major auto and truck manufacturers. Tremec, also known as Transmission Technology Corp., is a major producer of manual-transmission and drivetrain components.
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