Upgrade your Full Size Jeep’s drivetrain with this ultra-compact TH350 to New Process transfer case adapter kit. Engineered for strength and reliability, this precision-machined adapter is only 1.1" long, resulting in a total transmission and adapter length of just 22.9". Crafted from high-grade aluminum alloy, it features thick flanges and a heavy-duty cross-section for maximum durability.

This kit is compatible with any year and version of the GM TH350 transmission—including Chevy, Buick, Olds, Pontiac, and Unicase models—making it ideal for a wide range of Full Size Jeep engine swaps. Each kit includes a hardened, precision-splined output shaft for the TH350 (works with both 2WD and 4WD versions), which directly connects to the 23 spline NP/NVG input shaft for a strong and seamless integration.

Designed using advanced computer modeling, this adapter ensures an exact fit and robust performance in any build. Installation requires disassembling the transmission main assembly, so professional installation is recommended. Most installs are a straightforward 3–4 hour bench job, which is also a great time for a full transmission rebuild or upgrade. The included TH350 output shaft splines directly into your OEM Jeep input gears, and transfer case disassembly is usually not required.

Fits:

• All FSJs with TH350 Transmission

Kit Includes:

• Aluminum adapter housing
• Transmission output shaft (23 spline)
• Base mount
• Seal, O-ring, gasket
• Fastening hardware
• Installation instructions