The Advance Adapters Atlas gear-driven transfer cases are the ultimate in gearing and strength. With over 30,000 units sold, the Atlas 2 speed is the solution for combining both on and off-road performance.

The name is legendary and synonymous with rock crawling and off-road vehicle performance. Atlas Transfer Cases have won over the industry for their superior performance, bullet proof design and their ability to get you anywhere you want to go. The Atlas Transfer Case is sure to change the way your vehicle performs off-road. You will benefit greatly by understanding the Atlas characteristics and how to apply them for the ultimate in performance!

Jeep JL & JT to Atlas 2 speed: The Jeep JL with the 850RE 8-speed automatic with the 3.6L V6 or the turbo 4 cylinder  and the D478 manual 6 speed with the turbo 4 cylinder, coupled to a Magna transfer case. This is the first year Jeep went away from its standard circular bolt pattern when coupling these two gear boxes. To couple these transmission to the Atlas, they will require a new adapter. P/N 50-9900 is for the Automatic and P/N 50-9901 if for the manual or P/N 50-9903 for the Jeep 392's & 4xE. 50-9904 Jeep JL DIESEL 8-Speed Automatic. The adapter is 7.75" which provides the needed length to clear the transmission cooling system. Also see Atlas adapters

JL and JT 2018 & newer Jeeps equipped with an automatic transmission will also require a Transmission Control Module flash to operate correctly with the new Atlas transfer case.  Jeep coded the stock transfer case ratio of either the 2.72:1 or the 4.0:1 into this module and any different ratio in the transfer case will put the vehicle into a limp mode.  A Jeep programmer like a Z Automotive or the Vgate OBD2 code reader with the Canbus phone app from jscan, work great.  The exact ratios for the Atlas are required for re-programming the module. 

The electronics of the JL stock transfer case need to be connected to the Atlas. The nice thing is we have you covered with kit 300377A. The kit 300377A with a programmer for the transmission control module will allows the JL to retain all the stock functions that it came with stock when installing an Atlas.

Gearing Options Available:

• High range.....1:1
• Low range......2.0:1 or 3.0:1 or 3.8:1 or 4.3:1

Diff Yoke Options Available:

• 1310-1350 CV & Non-CV
• 1310 CV Yoke
• 1350 CV Yoke

Specifications

• Kit Package: Yes

Warranty: See Individual Parts

Fitment: JL