As already stated the 8 3/4 rear that came in A-body cars was always SBP. I pulled a 8 3/4 rear out of a '71 Dart Swinger Special before, it was factory installed and the car was a 318 auto. I have also seen a 70 Duster slant 6 3 spd. manual with factory 8 3/4. A lot of manual trans. cars got...