Upgrade Your 5 Speed Allison to a 6 Speed!

Would you like to learn more about adding 6 gear to your LB7 or LLY?

DuramaxTuner.com offers the best 6th speed conversion kit for your truck.  Our extensive R&D and over a decade of experience with the LB7 and LLY platform have given us the insight and technical expertise to put together the best package on the market.  Now you can easily install a reliable and fully functional 6th gear to your beloved LB7 or LLY. 

6 Speed Conversion Kit.jpg

Our 6 Speed Conversion kit includes:

  • Brand New Valve Body
  • Everything required for installation except fluid
  • Custom TCM Tuning

6 Speed Conversion