This BD Diesel 1031315 Allison Pressure Controller is a great upgrade for 2011 - 2016 GMC/Chevrolet vehicles with 6.6L Duramax & Allison Transmission. It can increase the theoretical holding power by 25% - 115% and deliver up to 275psi of line pressure at WOT. Unlike most solenoid foolers and plugs that are always active, the 1031315 only activates when the boost goes over 15psi. It doesn't create extra heat or parasitic load when inactive, and won't cause unusual shifts. Plus, no transmission relearn is needed, and it can be installed in under an hour.

How to use: The controller will automatically activate when the boost goes over 15psi. Just install it in your vehicle and let it do its job. Note: Make sure your vehicle is from 2011 - 2016 and has a 6.6L Duramax & Allison Transmission. Maintenance: There's no special maintenance required. But check the installation regularly to ensure it's still in place and working properly. If you have any problems, consult a professional mechanic.