Our crossmembers allow for the installation of the popular automatic AOD, C4 or C6 transmission into your 1948-64 Ford F-Series truck. With the new technology of this xmember, it may also be used for GM applications, TH350, Th400, 700-R4 and Muncie 4 Speed transmissions. They also allow for booster clearance on power brake applications. These items are high quality items at a very moderate price.