The Advance Adapters 4L80E 2.75" to Atlas 2SP Adapter Kit (SKU AS-6450) mates a GM 4L80E automatic transmission to an Atlas 2-speed transfer case, replacing the older two-piece adapter design with a single housing. The housing has a 40-tooth reluctor ring built in, which supplies the output-shaft speed signal the 4L80E’s computer needs — useful on transmissions that didn’t come with one from the factory.
Fitment note: this kit requires a 4WD output shaft. The GM 4L80E has a 26" case length and 17 oil-pan bolts, with a 6-bolt hex pattern on the rear case half. 4WD 4L80E transmissions built through 1996 typically already have a rear reluctor ring in the case; 1997-and-newer 4WD units have the sensor provision but left the reluctor ring out — which is exactly what this kit’s built-in VSS reluctor is designed to replace. Advance Adapters recommends verifying your specific transmission’s configuration before ordering, since these details vary by production year.
What’s included:
- Speedometer sensor (300619)
- VSS reluctor ring, 40-tooth (300623)
- Adapter, 4L80E to Chrysler/Jeep (51-6450)
- GM auto transmission O-ring (716511)
- Bolt, 10mm x 1.5 x 30mm F.H.H.S., grade 8.8 (720020)
- Reluctor ring screw (300617A)
Not sure this is the right adapter for your 4L80E swap? Case length, bolt pattern, and reluctor setup all vary enough across production years that it’s worth double-checking your transmission before ordering.