DHD Universal 6-Speed Alli-Locker Torque Converter Lockup Switch 2006+

The DHD Dirty Alli-Locker torque converter lockup switch was designed to be an exact fix for the ever long pursuit of true lockup controller that will work 100% of the time. After countless troubles with different aftermarket kits built by other vendors that were unreliable, DHD set to make the best lock up switch on the market. When you’re in a competition event, and a win is needed to move onto the next round, you can’t rely on a lockup box that only works when it wants to.

The DHD Dirty Alli-Locker torque converter lockup switch won’t leave you second guessing if your Allison torque converter is fully locked up or not. DHD built a simple kit that overrided the TCM and allows full manual control of the Allison torque converter clutch at any time. There are two modes, manual and automatic. Automatic mode is required for daily driving, but in the event that you want to immediately lock or unlock the converter, you can do so, at the flip of an easy to access switch. Manual mode will give user control, which is great for sled pulling or drag racing events.

There isn't any need for boxes or interceptor modules that need to be mounted under the hood or on firewall. Installation is a breeze with a simple wire harness that will need to be routed and interfaced with the TCM. After that, a switch is provided that you can mount in dash with factory hardware.

Note 1: This is an off-road/competition use ONLY product. It was solely designed for closed course drag racing or sled pulling events.

Note 2: Always remember to flip the toggles switches back to stock mode when not in use. We recommend having the locker active only during the immediate demand for lockup. Driving with the switches demanding lockup may cause erratic shifting, check engine lights or limp mode events.

Note 3: This product is our universal mounting box that will work on all 2006+ 6 speed classic series Silverado & Sierra pickups. Or if you prefer, we also offer a dash mount for 2006-2007 classic body style trucks. See DHD 116-610. 

Note:  We have not confirmed proper operation of the alli-locker on 2016 LML and 2017+ L5P trucks. Changes to the Allison TCM (T87) logic may limit the boxes effectiveness or cause erroneous codes. Additional TCM tuning may be required to limit TCM controlled converter lockup. DHD Recommends only editing these functions on Off Road Vehicles.

Install Diagrams:

LBZ/LMM 6 Speed

2011-2015 Early LML 6 Speed