, 12" diameter, Mild Performance, Not for Big Block. 20400 (5) GM 65-91 TH400, ... A-727 (1 6) . . .$151.99 40427 Ford 71-91 C6 w/351C, 351M, 400M, 460 cid ... pilot (3) . . . . . . .$159.99 50440 Ford 70-82 step case C4 with 10.5" bolt ... 1.375" crank pilot . .$154.99 40437 (9) Ford 80-92 AOD with 11.4" bolt circle, 1.375 ... , 12" diameter, Mild Performance, Not for Big Block. 20404 GM 65-91 TH400, TH425 ... , 10" diameter, Mild Performance, Not for Big Block 20402 GM 65-91 TH400, TH425, ... 1800-1900 RPM, Same as OEM diameter, Motor Home/RV Towing, Furnaced Brazed 20423 ... 314.99 70431 GM 91-01 4L80E (not for diesel applications ... A-727 (1 6) . . .$256.99 40425 Ford 71-91 C6 w/351C, 351M, 400M, 460 cid ... pilot (3) . . . . . . .$239.99 50480 Ford 89-99 E4OD (not for diesel ...