SKU: ADV50-6902
MPN: 50-6902
The Advance Adapters 700R4 to NP205 Adapter Kit provides a direct solution for builders replacing TH400 setups with overdrive-capable transmissions. This kit bridges 700R4, 4L60, and 4L60E automatic transmissions to 1971-84 GM NP205 transfer cases, giving four-wheel-drive trucks and off-road rigs the fuel economy benefits of a modern overdrive transmission while retaining the proven durability of the NP205. For enthusiasts building trail rigs, tow vehicles, or restored 4x4 trucks, this adapter eliminates custom fabrication and delivers a bolt-together installation path.
The kit includes a new output shaft and spud shaft assembly engineered to mate the transmission's output spline pattern to the transfer case input. An adapter plate, plastic washer, TH400 gasket, O-ring, and metric fastening hardware complete the package. Installation requires use of the original GM TH400 4WD adapter housing, which serves as the intermediate component between the transmission and transfer case. Advance Adapters includes detailed instructions covering alignment procedures, torque specifications, and clearance checks. The 14-inch by 11-inch by 9-inch package dimensions accommodate the shaft assembly and hardware without separate shipments. Builders working on drivetrain swaps will find all necessary components in one box.
This adapter kit suits anyone converting a 700R4-equipped vehicle to part-time four-wheel drive or swapping an older TH400 setup for better highway fuel economy. The NP205's cast-iron case and gear-driven internals handle high-torque applications from built engines, making this combination popular for tow rigs and trail machines alike. Pair this kit with quality universal joints and a properly measured driveshaft to complete the installation. We stock drivetrain adapters and conversion components for GM, Ford, and Jeep applications.
This adapter kit works with GM 700R4, 4L60, and 4L60E automatic transmissions. These overdrive transmissions share the same output shaft pattern, allowing the single adapter kit to serve multiple transmission variants in the same family.
Yes, installation requires the original GM TH400 4WD adapter housing. This component serves as the intermediate piece between your transmission and the NP205 transfer case. The housing is not included with the kit and must be sourced separately.
The kit fits 1971 through 1984 GM NP205 transfer cases. These are the cast-iron, gear-driven transfer cases commonly found in full-size GM trucks and Blazers. Earlier or later NP205 units may have different input configurations.
The 700R4 and its successors offer overdrive gearing that the TH400 lacks. This translates to lower engine RPM at highway speeds, improved fuel economy, and reduced drivetrain wear during extended road travel while maintaining the NP205's off-road durability.
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