Soft or Slipping 1-2 Shift

SOFT OR SLIPPING 1-2 SHIFT
1. Powertrain control system electrical inputs and outputs, wiring harnesses, Powertrain Control Module (PCM), shift solenoids, and transmission range sensor.
2. Faulty main control valve body
3. Intermediate/OD band, servo piston, rod bore, rod, or spring damaged.
4. Forward one-way clutch assembly damaged.
5. Forward clutch assembly damaged.
6. Low one-way clutch assembly damaged.
7. Low reverse clutch assembly friction elements damaged.
8. Leaking air pressure in servo apply and servo release circuits.