General Motors will build a new variant of its Hydra-Matic rear-wheel-drive six-speed transmission for its heavy-duty pickups. The new electronically controlled six-speed automatic transmission will be standard on the all new 2007 GMC Sierra and Chevrolet Silverado heavy-duty pickups.

The advantages of a six-speed transmission include improved fuel economy, and performance. The six-speed transmission has the capability for Driver Shift Control (Tap Up/Tap Down) and Tow/Haul Mode.

## Source: General Motors ##

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