07-18 Wrangler JK, 2 & 4 Door;Rubicon models only;NP271 transfer case;Allows you to use low range in 2WD;California Residents: WARNING This kit tells the computer system that the vehicle is in low ratio, disabling the ESP on JKs and enabling the locker option on the TJ Rubicons & Power Wagons. The 300377A is the most recommended kit for the Jeep JKs.. Advance Adapters Low Range Switch - 300378A This kit is a quick fix for the Jeep TJ Rubicons, JKs & Power Wagons.
The JK control module is the only way of keeping all the stock functions operational when upgrading to an Atlas transfer case..This Module lights the dash lights in both high and low range as well as the settings on the ESP when in 4WD and lockers and swaybar disconnect on the Rubicon models. Advance Adapters Atlas Control Module - 300377 This kit is designed for the Atlas 2 speed but can be used on a 4 speed, However, the is no provision to connect an additional low range switch in the planetary housing.