JK ATLAS CONTROL MODULE

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. 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.

NOTE: This Kit ( is for use on Vehicles with Atlas Transfer Case Production date of pre August 2014. If your Atlas production date is post August 2014, you will need part number P/N 300377A

November 2023 we updated to new wire color code on the control module. We have kept both instruction sheets listed for the older color coded kits.

Bill Of Materials

• LOW RANGE PIGTAIL FOR JK CONTROL MODULE / 300378-LR
• SWITCH-TJ 4WD / 300378
• 4WD PIGTAIL FOR JK CONTROL MODULE / 300378-4WD
• CONTROL MODULE, HARNESS SUB ASSY / 42R800-A
• O-RING- 014 / 300611
• MICRO FUSE HARNESS SUB ASSY / 42R800-C
• MINI FUSE HARNESS SUB ASSY (JEEP JL) / 42R800-D
• POWER SUPPLY WIRE FOR 42R800 KIT / 42R800-E
• HEAT SHRINK BUTT CONNECTORS / 42R800-F
• HEAT SHRINK 2" FOR FUSE TAP / 42R800-G