Fits Years: 1966-1970 Fits Transmissions: A727 3-Speed, NAG1 5-Speed, 8HP70 8-Speed automatic Crossmember allows installation of an A727 3-Speed, NAG1 5-Speed, or 8HP70 8-Speed automatic transmission into Mopar B Body cars. Comes with all needed adapters for each of the above transmission Works with up to 3" exhaust Durable Black Powder Coat finish Installation hardware included To be used with standard GM Transmission mount ( GMTM or GMTM-S ) NOTE: Tunnel modifications may be required for these larger, modern transmissions.