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New Silverado HD Series 6 Speed Transmission………… February 13, 2007

Posted by wilsonniblett in Auto News.

The newly redesigned Chevrolet Heavy Duty pick-ups are going to be landing on dealers lots within the month. While talking to a client about the new 2007 Silverado HD Series Pick Up, I realized that there might be a few Chevy fans out there that do not realize that there is a new 6 speed electronically controlled automatic transmission.  This unit will offer a better means to keep the engine in the best torque power band while hauling a load of pulling a trailer.  As a work style truck, this is an ideal addition to a stellar product.  For that matter, this would make a great unit for enthusiasts to pull their car trailers with…………maybe this would be a good time to replace my personal truck!

The Chevy Enthusiast

The following is the Press Release from General Motors with respect to the new 6 speed:

GM Builds New Six-Speed Rear-Wheel-Drive Transmission Variant In Ypsilanti For Heavy-Duty Pickups

YPSILANTI, Mich. – General Motors’ (GM) Ypsilanti Transmission Operations is producing a new variant of its Hydra-Matic rear-wheel-drive six-speed transmission. The new 6L90 six-speed electronically controlled automatic transmission is standard in the all new 2007 GMC Sierra and Chevrolet Silverado heavy-duty pickups.

Advantages of the new 6L90 transmission include improved fuel economy, performance and handling:

  • The 6L90 transmission has a wide overall ratio spread of 6.04, compared to 3.31 in the previous 4L80 used in the heavy-duty pickup trucks. This allows a “steep” 4.03 first gear, which provides an improved performance launch feel.
  • With this wide ratio spread, there are smaller steps between the gears, optimizing the gear ratio for towing, providing good shift quality, and maximized acceleration and fuel economy.
  • With two overdrive gears – fifth and sixth – engine rpm is reduced by approximately 19 percent at 60 mph – a reduction of about 400 rpm. A lower engine speed reduces engine wear and improves fuel economy. Engine noise is also lower during cruising.
  • The 6L90 has the capability for Driver Shift Control (Tap Up/Tap Down), Tow/Haul Mode, Auto Grade braking and uses DEXRON VI premium fluid, which has been validated to improve durability and provide more consistent shift performance in extreme conditions.

The GM Ypsilanti Transmission Operations (YTO) has produced nearly 200,000 transmissions since it opened in January 2003. The plant employs 500 people. YTO currently produces the 6L80 six-speed transmission for the Cadillac Escalade ESV and EXT; the Cadillac XLR and XLR-V; the Cadillac STS-V; the GMC Yukon Denali; and the Chevrolet Corvette. It also produces the 6L50 six-speed transmission for the Cadillac STS and the SRX.

General Motors Corp. (NYSE: GM), the world’s largest automaker, has been the global industry sales leader for 76 years. Founded in 1908, GM today employs about 284,000 people around the world. With global headquarters in Detroit, GM manufactures its cars and trucks in 33 countries. In 2006, 9.1 million GM cars and trucks were sold globally.



1. Rob Thrash - December 23, 2009

I have a 2009 1/2 ton Silverade 4-door with this tranny, and with a fully loaded 12 foot single axle trailer in towing mode, you would think your driving a big rig with a “Jake Brake” because thats how the transmission acts when breaking, it uses the engine to assist in slowing. which greatly reduces brakes wear and learching. Plenty of off the line power and can easily keep up with expressway traffic and passing if desired. I am a long time GM customer and they did not nor have they dissappointed me to date with their vehicles.

2. Terry J - May 14, 2011

Will a chev 1500 truck with the 6sp. trans and 3.4 RE perform as well or better for pulling loads as the 5.3 and 4sp. with a3.7 RE. Both equipped with 5.3 motor? Thanks

3. mark dearing - September 25, 2011

Looking for the best option of 6 spd. auto trans. for a LS engine to be installed into a 1958 Chevy Impala / street rod ??

4. bill howell - July 11, 2014

I have a 1980 Malibu with a 6.0(LS9/LQ4)and a 4L60E.3.42rp It.s a beast as is but I thought about going to an automatic 5 or 6 speed auto and go to 4.11rp for the all around performance and still get decent gas mileage.I turn 77 on the 20th of July and have always had fairly fast cars. This will probably be my last street rod,so I want it to be bad. motor is stock, has eaton locker. any suggestions. my e-mail is billykhowell@gmail.com any suggestions appreciated


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