The Advance Adapters JL Manual 6-Speed to Atlas kit (SKU 50-9901) is built for the Jeep Wrangler JL's D478 manual 6-speed transmission, which is paired from the factory to a Magna transfer case. When Jeep introduced this manual driveline, they moved away from the standard circular bolt pattern previously used to couple the transmission to the transfer case — the first time that pattern had changed on this platform. That meant a new adapter housing was needed to mate an Atlas transfer case to the manual 6-speed, and this kit is that adapter.
The housing steps down to a standard Atlas 23-spline input, and at 7.75" it's sized to keep the transmission sitting close to its stock location in the chassis — worth knowing if you're planning clearances for the swap.
One thing worth flagging: this listing shares the same shifter components and adapter housing part number (50-9901) as the automatic-transmission version of this swap, so the housing itself is common across both applications even though this kit is specced for the manual.
What's included:
- Adapter housing and shifter components (shared with the automatic version, 50-9901)
- Shaft, JP 43F x JP 23M, 5.76" OAL
- Sealed Bearing 209RS
- Snap Ring, T350/T400
- True Arc Snap Ring
As with the other kits in this Atlas-adapter series, the sealed bearing and snap rings are included so the shaft is fully supported in the housing.