1304-065-902  Nodular Iron 1st design SuperT-10 main case as used in over the counter Power Brute /Borg Warner 4 speeds . 7/8 Lower countershaft bore . NOT the same as a T10-1B common main case , will only accept the Longer SuperT-10 cluster [ plus .050 longer] Can be bored  to 1 Pin Fit ,which would be the same as  the 1304-065-904 1 in Nodular Iron case. will increase transmission  Strength by increasing rigidity. Cleaned, inspected excellent used condition. shipping to lower 48 only no exports.