duramax tuner

Duramax Tuner 6 Speed Conversion Kit - 01-05 GM Duramax LB7/LLY

Thoroughbred Sku #: DUT6SPEEDKIT-CRE

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Shipping Restrictions:
This part is NOT available to ship to the state of California.

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Product Details

Product Name: Duramax Tuner 6 Speed Conversion Kit
Manufacturer: Duramax Tuner
Manufacturer Part #: 6SPEEDKIT
Thoroughbred Diesel Part #: DUT6SPEEDKIT
Fitment Notes: 2001-2005 GM Duramax LB7/LLY

Improve your LB7 or LLY's reliability by utilizing our in-house designed and tested kit coupled with Calibrated Power established transmission tuning. Calibrated Power's calibrate firmness and timing of shifts, so you'll be guaranteed to feel the smoothness and better shift quality missing on the 5 speed Allison. If you're like the rest of us here at Duramaxtuner using our trucks as daily drivers, the added gear helps take wear and tear off your engine while cruising at high speeds. It keeps your RPMs at the most efficient curve of the rev range, giving it the best ride possible!

In addition to helping keep your truck on the road longer, something you will notice is the added bump in fuel economy. This is especially true for those of us logging long commutes via highway. Less RPMs, the better your fuel economy. Picking up just a little bit goes a long way while putting on the commuting miles. You'll also notice the how much quieter your ride will be when adding our kit to your truck. NVH(Noise, vibration, and harshness) will decrease drastically, giving you a much more enjoyable ride.

Calibrated Power 6 Speed Conversion Kit Features:

  • Custom TCM tuning for your specific truck
  • Double Overdrive = 14% RPM reduction
  • All new valve body, wiring harness, and solenoids
  • Lowered road noise
  • Gear indicatior works on Edge CTS monitor
  • Works with high idle, retro fit tap shifters
  • For more on Calibrated Power call us at 1-859-737-4966.


  • Why can't you ship to Commiefornia?

    Glenn Philipps | 12/10/2022

    No C.A.R.B. certification.

  • How much horsepower is it capable of handling?

    Tommy Lee Walker | 11/5/2022

    The valve body is not horsepower rated. The horse power rating would depend more on the transmission upgrades you have.

  • Do you ship to Alaska? How much? Can I still use my Edge CTS 3 to change the tire size and maintain calibration?

    Billy Bridges | 8/12/2022

    Yes. We will require a zip code to calculate. yes.

  • Will this work for the 8.1L with the Allison transmission

    Nathan Gentry | 12/30/2019

    No, this is designed for the 6.6l diesel with the Allison 1000.