1-2 Upshift Is Above 40 MPH at Moderate Acceleration

1-2 UPSHIFT IS ABOVE 40 MPH AT MODERATE ACCELERATION Engine Stall Speed Exceeded In R, OK In OD, D, 2ND and 1ST
1. Vacuum system malfunction.
2. Main control pressure malfunction.
3. Governor damaged or worn.
4. Sticking or dirty valve body.