Basic shift kit

First off, the 1-2 shift cannot overlap. 1st gear is the rear clutch, 2nd gear is the rear clutch and front band. The 1-2 shift simply applies the front band.

The 2-3 shift can over lap, but this can be "fixed" even without a shift kit. By design, the 2-3 shift applies the front clutch while it FORCES the band to "unapply". This allows the apply pressure to stay present, so any call for "kickdown" gets the snap you need to pass another car. By restricting the apply passage to the clutch, and opening the "unapply" passage to the band, the split second timing of the two events gets better sequencing. Most shift kits have this modification included. If your shift kit does not at least have the metal template to do the drilling for the "unapply" passage, select another shift kit.