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6 Speed Conversion Kit

Availability: In stock

6 Speed Conversion Kit

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6 Speed Conversion Kit

Enhance multiple aspects of your ride with the Duramaxtuner 6 Speed conversion kit!


Take your '01-'05 Allison to a whole 'nother level by adding a sixth gear!



  • 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



Improve your LB7 or LLY's reliability by utilizing our in-house designed and tested kit coupled with our established transmission tuning. We 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. 

Give us a call if you have any further questions and one of our reputable sales staff will be happy to answer any questions!

Availability: In stock

$1,575.00

Price as configured: $1,575.00

5-6 Speed Conversion Kit   +$0.00
5-6 Speed Conversion Tuning   +$0.00
TCM Core (AL5)   +$250.00
5 Speed Valve Body Core   +$350.00

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Price as configured: $1,575.00