DIAGN No drive in any selector position cannot load engine Low oil level Clogged oil section pipe screen Broken or disconnected manual valve cable Defective pressure regulator valve Defective line pressure limit valve Front pump defective Rear pump check valve check valve poppet or rear pump priming ball not seating Both must occur for possible malfunction Front pump shaft disengaged at either converter or pump gear Front pump priming ball not seating Engine speed flares on standstill starts but acceleration lags Low Band Partially Applied a Low oil level b Clogged pickup pipe screen c Improper band adjustment d Servo piston apply passage blocked e Servo piston ring broken or leaking f Band facing worn g Low band apply linkage disengaged or broken h Converter stator not holding rare Engine speed flares on upshift r Low oil level t Clogged oil section screen or pipe High clutch partially applied blocked feed orifice Clutch plates worn Clutch seals leak Clutch piston hung up Clutch drum relief ball not seating Vacuum modulator hose collapsed Transmission will not upshift I Low band not releasing probably due to a Stuck low drive valve b Defective governor I c No rear pump output such as stuck priming ball drive pins not engaged or defective pump d TV valve stuck or maladjusted e Maladjusted manual valve lever Upshifts harsh Incorrect carburetor to transmission TV rod adjustment Improper low band adjustment Vacuum modulator hose broken or disconnected I Vacuum modulator diaphragm leaks Vacuum modulator valve stuck Hydraulic modulator valve stuck SIS GUIDE Closed throttle coast downshifts harsh Improper low band adjustment Vacuum modulator hose disconnected broken Vacuum modulator diaphragm ruptured Vacuum modulator valve stuck Engine idle speed too high Sticking valves in valve body pressure regulator or hydraulic modulator valves Car creeps excessively in Drive Idle speed too high Car creeps in Neutral Incorrect manual valve lever adjustment High clutch or low band not released No drive in Reverse Manual valve lever improperly adjusted Cable linkage adjustment Reverse clutch piston stuck Reverse clutch plates worn out Reverse clutch leaking excessively Blocked reverse clutch apply orifice Improper shift points see Shift MPH Chart Incorrectly adjusted carburetor to transmission Incorrectly adjusted TV valve Governor defective Rear pump priming ball stuck Oil forced out of filler tube Oil level too high causing planet carrier to run in oil and cause foam Oil pickup pipe split or not sealed causing air entrainment Unable to push start Rear pump drive gear not engaged with drive pins on planet carrier hub Rear pump defective Rear pump priming ball not seating CORVAI R POWERGLIDE SHIFT POINT MPH CHART UPSHIFTS MPH Minimum Throttle 10 12Y2 Full Throttle 41 47 Part Throttle Detent Touch 34 41 DOWNSHIFTS Closed Throttle 8 12 Full Throttle 38 44 Part Throttle Detent Touch 23 30 Manual Low Inhibited 41 46 CaRVA1R SWOP MANUAL