70 340 duster non ac radiator fan

Here's what I found in my manual for a 1970 340 4spd Dart............

Fan 2863 215.......18 x 2 1/4 pitch torque drive clutch (no thermal spring)
Fan 2863 216.......18 1/2 x 2 1/2 pitch torque drive clutch, if equipped with 3.55, 3.91, or 4.10 rear axle ratios.

That's all I've got. :thumbsup: