TH400 Transmission Mockup

The G Force Performance Products GF-MUT-TH400 is a TH400 transmission mock-up block. Its patent-pending tab-and-slot design provides accurate transmission mounting and yoke positions for GM cars and trucks from 1964-1990.

This lightweight, disassembled mock-up block allows for easy placement by hand, eliminating the need to handle a heavy transmission. It features a rear mount plate for short-tail TH400 transmissions, with an option to bolt on a tail shaft for long-tail configurations. The durable steel construction resists welding heat, facilitating the fabrication of custom crossmembers.