Diesel Tuner's Blog

Who Needs 6th Gear? LB7/LLY 6 Speed Conversion!

[fa icon="calendar'] Dec 20, 2017 10:00:00 AM / by Paul Wilson posted in LB7, LLY, 5 Speed, 6 Speed Conversion Kit

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5 to 6 Speed Allison Conversion:

The Allison 1000 transmission equipped in the 2001-2005 HD Silverado and Sierra was considered to be revolutionary when it was released. 

 

Owners rave about the smoothness and reliability of the 5 speed Allison transmissions.  They're able to reliably handle the strain of towing heavy and still have reasonable street manners for commuting.  Duramaxtuner has recently invested considerable time into the AL5 controller to build out the shift shedule and quality of all the 5-6 and 6-5 shifts.  Matched with our upgraded valvebody this kit will have your 15 year old truck shifting like a 2018 model. 

As most technology has advanced over the last 12+ years, so has transmission technology.  You've probably noticed that just about everything on wheels has more gears these days.  Starting in 2006 all Duramax powered GM trucks were given an extra overdrive gear (.61).  Since then, they haven't looked back. 

Why is that?  Why does your truck need more gears? 

Benefits from more gears:

  • MPG improvement 
  • Noise Reduction
  • Parts Longevity
  • Narrower Cruise range to meet Emissions Requirements
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