Manual Shift From OD or D to 1 at 55 MPH - Shifts at 45 MPH

MANUAL SHIFT FROM OD OR D TO 1 AT 55 MPH - SHIFTS AT 45 MPH Kickdown Shift Speeds Too Early
1. Main control pressure malfunction.
2. Sticking or dirty valve body.
3. Governor damaged or worn.
4. Improperly adjusted or sticking kickdown linkage.