Loading... Please wait...Tremec 3rd/4th Shift Fork. This unit is made of steel, an upgrade over the aluminum fork used in some pre-2001 T56 Transmissions. Includes Tremec #159 3rd/4th Shift Fork Pad Set (these are OEM plastic) standard, you can upgrade to bronze when adding to cart. #158 on the T56 Transmission Disassembled View, seen here, here and here.