BD-POWER 1030703 2LOW UNLOC for RAM trucks will work with the vacuum system and CAD on Jeep YJ. I installed several days ago in about 30 min. This gives selectable 2 wheel drive low gear with a flip of a switch. I have a lunch box locker up front and wanted to be able to switch off for sharp turns and it works great. I also still have one front wheel (driver side) power in 4 wheel drive with kit turned ondue to torq q locker. It is a poor mans selectable locker you can install in the driveway. No need to install Posi-Lok and alter factory CAD. The CAD on older Ram trucks is the identical system. I tested system this weekend and it worked great.