After almost 40 years 66 Dart

toolmanmike said
L = Dodge Dart
L = Low price class (170 model)
21 = 2 door sedan
B = 225-6
6 = 1966

I see it is a 3 speed
7226 of that combination manufactured for US sales

7226 were Manufactured?

It was three on the tree I converted to floor shift.