GM automatic TH350 to MP231 transfer case adapter. GM automatic four wheel drive transmission to transfer case adapters with factory 4 wheel drive mainshaft 1989-95 YJ Wrangler replacing an AX15 transmission with 23 spline output shaft (transmission mainshaft not included). For use with New process 231 transfer case.
Advance Adapters got its start in Downey, California in 1971 with a single adapter mating a Muncie car 4-speed to a Jeep Dana 18 transfer case. Eventually headers, overdrives, motor mounts and linkage brackets were added to the offerings to complement their core adapter components. When interest in rock crawling spiked in the mid-1990s, Advance Adapters offered low ratio transmission swaps then switched gears into the ultra-low gear transfer case arena. Today, the company is based in Paso Robles, California and their engine and transmission conversions for Jeeps are in kit form and sold as individual components. Shop Advance Adapters Now