GDP 2017-2019 6.6L Duramax Custom T87 Transmission Tuning Package HP Tuners Tuning Credits:Add Credits (4) By simply turning the dial

By simply turning the dial left or right until it clicks

HP Tuners or other transmission pressure tuning

so for customers in severe duty conditions such as farming and off-road

Speed Demon LED replacement bulbs can fit vehicle daytime running lights (DRL)

GDP 2017-2019 6.6L Duramax Custom T87 Transmission Tuning Package HP Tuners Tuning Credits:Add Credits (4) By simply turning the dialGDP 2017 2019 6. 6L Duramax Custom T87 Transmission Tuning Package Package Includes: HP Tuners MPVI4 (Optional) 4 HP Tuners Tuning Credits (Optional) GDP Transmission Tune Note An HP Tuners MPVI4 & 4 Tuning credits are required to load the transmission tune into the vehicle