Unlikely it is the adjustment of the modulator, as the range is pretty narrow in which it will control upshift points at light/part throttle (high vacuum).
Leaking, defective or activated solenoid is more likely. The governor could be sticking, but this would be quite rare. If the governer gear was sheared off, it wouldn't make the shift at all.....Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
|