SEC1 AUTOMATIC 1 It Page General Description 7 2g Maintenance and Adjustments 7 2g Oil Requirements 7 29 Oil Level 7 29 Draining and Refilling 7 31 Shift Linkage Adjustment 7 31 Neutral Safety Switch Adjustment 7 31 Throttle Valve Linkage Adjustment 7 32 Low Band Adjustment 7 32 Service Operations 7 32 Service Operations Transmission in Vehicle 7 32 Range Selector Assembly 7 32 Control Cable Assembly 7 33 Vacuum Modulator q g4 Governor 7 34 Valve Body and Low Servo 7 35 Service Operations Transmission Removed from Vehicle 7 37 Disassembly of Transmission 7 38 GENERALI The Corvair Powerglide fig 7E 1 consists of an air cooled three element torque converter which drives through an automatic shift two speed planetary transmission As illustrated the Powerglide transmission is integrated to the differential carrier to form a Transaxlie As a result the converter is remote from the main transmission assembly being separated by the differential carrier Two shafts run axially through the hollow pinion shaft one from the converter cover hub to the front pump and the other from the turbine to the input sun gear to transmit converter torque to the transmission gear box Excepting the converter location mechanical components of the Corvair Powerglide are generally scaled down versions of comparable parts in conventional Powerglides The use of a plate type reverse clutch and a welded converter with integral starter driven gear are obvious exceptions Gear ratios are 1 82 1 in low and reverse and 1 1 in high gear Automatic low is also 1 82 1 MAINTENANCE OIL REQUIREMENTS The Powerglide transmission requires a special oil as specified in Section 0 of this manual This oil is available through Chevrolet dealers and oil company filling stations in sealed containers Oil Level The transmission oil level should be checked periodically 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 ION 7 RANSMISSIONS IDEX Page Inspection and Repair of Transmission Components 7 39 Front Pump 7 40 Clutch Drum 7 41 Turbine Shaft 7 46 Pump Shaft 46 Rear Pump and Reverse Piston Assembly 7 46 Converter 7 48 Planet Carrier Assembly 7 48 Assembly of Transmission 7 50 Front Pump Thrust Washer Determination 7 51 Transmission Removal and Installation 7 54 Diagnosis Guide 7 54 Hydraulic Pressure Data 7 54 Shift Points 7 55 Special Tools 7 56 ESCRIPTION Selector lever positions from top to bottom are Reverse Neutral Drive and Low No Park position is provided Power flow sequences in each range are identical to conventional Powerglide transmissions The manual low inhibiting feature is designed to protect the transmission from damage which could result from moving the selector lever into Low while the vehicle is traveling more than approximately 55 MPH For example if the driver moved the selector lever into low at 70 MPH the transmission would remain in high until vehicle speed was reduced to approximately 55 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 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 LND ADJUSTMENTS 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 CORVAR SHOP MANUAL