8.75 rear in 71 swinger slant six car?

IIRC, a 70 Dart or Valiant with a 318 and manual 3 speed on the floor had an 8 3/4 as standard.

A tow package would have an aux. transmission cooler and I think 3.55 or 3.23 gears, and heavy duty cooling. No 2.94 or 2.76 ratio.