The Advance Adapters JL Diesel 8-Speed to Atlas Adapter (SKU 50-9904) is built for the 2020-and-newer Jeep Wrangler JL diesel, which pairs the 3.0L EcoDiesel V6 with the 8HP75 8-speed automatic. It’s the diesel counterpart to the 50-9900 kit used on the gas-engine 850RE/8HP870 transmissions.
The kit bolts to the rear of the stock 8HP75 and includes a spud shaft that converts the factory bolt pattern to the circular 6-bolt, 23-spline output Atlas transfer cases need. The 8HP75’s output shaft sits further out than the gas-engine 850RE’s, which is why this diesel version uses a longer spud shaft (6.9" overall length) rather than the 50-9900 kit’s shaft.
What’s included:
- 850RE 8-Speed / Dodge 8HP870 8-Speed to Atlas adapter (51-9900)
- Shaft, Jeep 23 internal x Jeep 23 external, 6.9" OAL (52-9904)
- Sealed bearing 209RS (716308)
- Snap ring, TH350/TH400 (716450)
- True arc snap ring (716456)
As with the gas-engine 850RE adapter, the sealed bearing and both snap rings come included so the spud shaft is fully supported and retained in the housing.