The Advance Adapters TH350/700R Atlas Adapter (SKU AS-9111) is a 2.5" adapter that mates a GM 700R4/4L60E automatic transmission to an Atlas 2-speed or 4-speed transfer case. It’s machined from 356-T6 heat-treated aluminum alloy and requires the GM 700R4/4L60E to be a 4WD model running the stock GM output shafts.
Fitment note: the 4L60E version of this swap needs additional VSS (vehicle speed sensor) parts, sold separately — 1993-96 4L60E transmissions need kit P/N 716073E, while 1997-and-newer 4L60E/4L65E transmissions need the full AS-9300 kit. Advance Adapters also offers a heavy-duty transmission mount (P/N 716055) designed specifically for this adapter, sold separately.
What’s included:
- Stud bolt, 10mm x 1.5 x 50mm (720061)
- Nut, 10mm x 1.50, zinc (720011)
- Bolt, 3/8-16 x 3/4" H.H.C.S., grade 5 (723720)
- Adapter, 700R4 to Atlas, 2.5" (51-9111)
- Plate, 700R4 to 51-9111 (716020)
- GM auto transmission O-ring (716511)
Running a 4L60E instead of a 700R4? Check which VSS kit your transmission’s model year calls for before ordering — the sensor requirement is the main thing that changes between the two.