Diesel Tuner's Blog

Are You Getting Enough With 5 Gears??

[fa icon="calendar'] Jun 7, 2018 1:00:00 PM / by Justin Tyson posted in LLY, LB7, Transmission Duramax, 6 Speed Conversion Kit

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The Six Speed Conversion Kit from duramaxtuner.com has been unleashed and it’s a proven winner.  The fifth gear days of yore have passed the world by and the 2001-2005 LB7 and LLY owners are loving how much more the extra gear brings them.  Large amounts R&D and testing has given 5 speeds a better shift schedule and the highest quality 5-6 and 6-5 shifts. The upgraded valve body with have your aging truck shifting like a new model.

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Will a 6 Speed Conversion Kit Pay for Itself?

[fa icon="calendar'] Feb 8, 2018 10:03:00 AM / by Paul Wilson posted in better performance for lly, how to get better fuel mileage with LLY, LLY mpg, LB7, Transmission Duramax, 6 Speed Conversion Kit

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6 Speed Conversion Kit for the LB7 & LLY 5 Speed Allison:

Your 2001-2005 Silverado/Sierra HD diesel is powered by either the LB7 (2001-2004) or LLY (2004.5-2005) Duramax.  That Duramax is tied to one of the most popular automatic transmissions, the Allison 1000.

While the Allison 1000 was a big step forward, it still needed improvement.  The LB7/LLY models came with 4 gears and Overdrive, or "5 speed".   In 2006 General Motors (GM) released the 6 Speed transmission for the new at the time LBZ model and other HD trucks. 

Without getting too technical about how automatic transmissions work, they did not actually add a physical gear.  The Allison works through a series of clutch packs being applied with hydraulic pressure to create different gear ratios.  What GM actually did was design a brand new valve body and improved tuning to achieve the 6 speed Allison 1000.

I need a 6 Speed Conversion!

DuramaxTuner.com now has a 6 Speed Conversion Kit which includes a new valve body and custom tuned TCM that allows your truck to achieve 6th gear.  

Who Will The 6 Speed Conversion Kit Help?

  • Owners wanting a quieter ride
  • Drivers looking for a smoother shifting transmission
  • Highway commuters
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Diesel Performance Podcast: P0700, Allison Trouble Shooting

[fa icon="calendar'] Nov 11, 2016 6:00:00 PM / by Paul Wilson posted in DT750, Transmission Duramax, P0700, Allison, Trouble Shooting

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P0700 Codes in your LB7 and LLY

[fa icon="calendar'] Nov 7, 2016 11:50:41 AM / by Paul Wilson posted in DT750, Transmission Duramax, P0700, TCM, Allison, Trouble Shooting

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2001 - 2004.5 Allison 1000 Trouble Shooting

The Allison 1000 5 Speed transmission came in 2001 - 2004.5 heavy duty Chevy and GMC trucks.  At the time it came out it was cutting edge.  Smoother shifting and more robust than almost any other transmission that came from the factory.  

However, they do have a reputation for having issues once power and abuse have been added to the truck.  Most commonly they go into "Limp Mode" during the 4 to 5 upshift or 5 to 4 downshift under hard acceleration.  This will cause a check engine light to come up on your dash and the truck to be limited by power and speed.  When this happens the most reported code is P0700.  GM defines PO700 as Transmission Control Module Requested MIL Illumination.  Simply said, it's a general code for transmission issues and generally is accompanied by another code such as P0701, P0702, and so on.  

Many truck owners' first reaction is to replace the Transmission Control Module (TCM) as soon as this code pops up.  The reality is further diagnosis is needed to tell what the issue is and the best way to resolve it.  Never jump to conclusions and always take into consideration the circumstances behind the issue prior to the code coming up.  

Where can you learn more about P0700 codes in your Duramax?

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