If you didn't find one already, I think I have a complete &quot;bare&quot; housing from a &quot;55&quot; that should work. It was left over from a complete rear-end swap we did on our '67 &quot;550&quot;. It was easier to swap rears than rebuild the transmission that was destroyed by a previous owners &quot;repair&quot;. (Ground down the chipped  2nd gear to nothing on the counter shaft and then welded the nut on the shaft the top set of gears ride on).