Bully Dog "Super Agressive" Shift Enhancer #153002

2001-2005 GM 6.6L Duramax
Bully Dog Technologies
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The simplest, most effective kit available without having to pull the transmission, the new Allison Shift Enhancer literally gives the clutches more traction in the clutch packs. Which allows for a quicker shift, and 50 HP worth of additional holding power for the Allison 1000, 2000, and 2400 transmissions.


  • Increase Transmission Life
  • Lower Transmission Temperature
  • More Advanced Shift
  • Longevity of Transmission
  • Reduced Torque Converter Clutch Slippage
  • Extra Rear Wheel Horsepower
  • Cost Savings in Transmission Repairs
  • Economical


  • Transmission holds higher horsepower and torque
  • Increases the life of the transmission
  • Better clutch, horsepower and torque transfer to the wheels

Bully Dog 153002 Installation Guide

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(12 Ratings, 4 Reviews) Average Rating:
Bob (Indiana) 2/23/2011 11:35 AM
I had this product installed by a transmission shop and they warned me. I should have listened. It shifts so hard that it is always making the tranny go into LHM and throws codes all the time. My favorite is downshifting though. When you come to a stop and it shifts from 2nd to 1st it will do it so erradically and abruptly that you have to brace yourself. I called bully dog and they said well we are going to reengineer that. They didnt offer to fix anything, but gave me a free hat. What a joke garbage product.
B/D shift enhancer
upsdrivr (IL) 11/27/2008 1:31 PM
I installed this kit in my truck and thought it worked well. I don't really think it will hold the HP I have added, but it definitely makes the trans shift more firm. Maybe other reviewers didn't install the kit correctly?? Mine works well.....
not a good idea
Brummett (az) 10/5/2008 10:50 PM
this thing made my truck shift way to hard caused codes (shift range inhibited)and would stick in third gear. i would not recomend this product!!!!!!!
worse thing i've ever done
Anonymous (Unknown) 1/23/2008 6:08 PM
put this thing in thinking it would do something for my shifting, welp it did, it fahqed it up bad. made 2nd gear feel like the trans was falling out, and it only got worse after that. went to a BD valve body and never looked back.