mately 45 mph and then the downshift would occur Part throttle downshifts are provided to provide better low speed acceleration characteristics At speeds below 25 mph a downshift to Low will occur if the accelerator is moved to one half throttle or more The MAINTENANCE OIL REQUIREMENTS The Powerglide transmission requires an oil known as Automatic Transmission Fluid Type A bearing a AQ ATF mark This oil is available through Chevrolet dealers and oil company filling stations in sealed containers OIL LEVEL The transmission oil level should be checked every 1000 miles Oil should be added only when the level is near the ADD mark on the dip stick with oil at normal operating temperature The oil level dip stick is located in the right front of the engine compartment NOTE The difference in oil level between Full and Add is one 1 pint In order to check oil level accurately the engine should be idled with the transmission oil at normal temperature and the control lever in neutral N position It is important that the oil level be maintained no higher than the FULL mark on the transmission oil level gauge DO NOT OVERFILL for when the oil level is at the full mark on the dip stick it is just slightly below the planetary gear unit If oil is added which brings the oil level above the full mark the planetary unit will run in the oil foaming and aerating the oil This may cause malfunction of the transmission assembly due to improper application of the band or clutches If the transmission is found consistently low on oil a thorough inspection should be made to find and correct all external oil leaks Transmission oil leakage is easily identified as all automatic transmission fluid used in Chevrolet production is dyed red Fig 6E 1 Powerglide Tra 1 Front Pump Cover 14 Reverse Clutch Front Reaction 2 Front Pump Shaft Drive Hub Plate Thick 3 Front Pump Drive Gear 15 Reverse Clutch Faced Plates 4 Front Pump Driven Gear 3 Used 5 Transmission Vent 16 Reverse Clutch Reaction Plate 6 Front Pump Body 3 Used 7 Low Band Adjusting Screw and 17 Short Pinion Lock Nut 18 Low Sun Gear Bushing 8 Low Band 19 Planet Carrier Hub Transmission 9 Clutch Drum Reaction Plate Output 3 Used 20 Reverse Piston 10 Clutch Drum Faced Plate 21 Reverse Piston Return Spring 2 Used 17 Used 11 Clutch Piston Return Spring 15 Used 22 Rear Pump Driven Gear 12 Turbine Shaft Front Bushing 23 Rear Pump Drive Gear 13 Reverse Clutch Retaining Ring 24 Governor Driven Gear Clip 25 Governor Drive Gear subsequent upshift will occur at 34 41 mph As with the conventional Powerglide wide open throttle downshifts are possible with the speed limitations being 38 44 mph ND ADJUSTMENTS All mating surfaces such as the front pump oil pan rail filler tube governor and the attachment to the differential carrier should be carefully examined for signs of leakage The vacuum modulator must also be checked to insure that the diaphragm has not ruptured as this would allow transmission oil to be drawn into the intake manifold Usually the exhaust will be excessively smoky if the diaphragm ruptures due to the transmission oil added to the combustion DRAINING AND REFILLING No periodic draining of the transmission oil is recommended When the transmission requires repair drain the oil by loosening the filler tube attaching nut in the oil pan and allow oil to drain no drain plug is provided To refill the transmission tighten the filler tube attaching nut and add four 4 pints transmission fluid using J 4264 filler tube and funnel Start engine and allow engine to idle in Neutral 3 5 minutes to warm oil then check oil and add as required to raise to the level of the FULL mark Assuming that the converter was not drained since it is welded and allowing for a nominal spillage or draindown approximately six 6 pints of oil will be required for refill CAUTION Do not over fill The dry capacity of the transmission including converter is 12 pints Normal refills require 6 pints SHIFT LINKAGE CHECK AND ADJUSTMENT Check If improper shift linkage adjustment is suspected a check can be made quickly without any disassembly as described below 1 Start engine If job is cold allow 2 3 minutes for nsaxle Cross Sectional View 26 Turbine Shaft 42 Long Pinion Gear 27 Front Pump Shaft 43 Reverse Clutch Plate Retaining 28 Converter Hub Bushing Ring 29 Converter Pump 44 Ring Gear 30 Starter Gear 45 Valve Body Ditch Plate 31 Stator 46 Valve Body 47 Oil Pick up Pipe 32 Turbine 48 Low Servo Piston 33 Engine flex Plate 49 Low Servo Piston Cushion 34 Stator Cam Race Spring 35 Converter Hub Seal 50 Low Servo Piston Return Spring 36 Stator Shaft 51 Clutch Drum Piston 37 Pinion Shaft Rear Oil Seal 52 Clutch Drum Hub 38 Pinion Shaft Bushing 53 Clutch Drum Selective Thrust 39 Rear Pump Wear Plate Washer 40 Reverse Piston Outer Seal 54 Clutch Drum Bushing 41 Planet Carrier Input Sun Gear 55 Front Pump Body Bushing