60 62 Ser 60 SBC w 13 000 lb axle 63 66 Ser 50 exc 15 000 Ib 2 Spd axle 4 cyc Diesel 65 Ser 50 Tilt 4 cyc Diesel exc 2 Spd axle 66 Ser 50 4 cyc Diesel exc 15 000 Ib 2 Spd axle 67 70 Ser 40 3697746 2 12 25 18 teeth 27 splines 62 65 Ser 50 60 2 Spd axle w vacuum shift 3708820 1 17 75 right 29 splines 2V1 wide forged 3708820 56 59 Ser 9 10 w 18 000 lb 2 Spd axle 60 62 Ser 80 w 2 Spd axle 58 59 Ser 9 10 w 18 000 Ib axle exc 2 Spd 60 66 Ser 80 w 18 18 500 Ib axle 64 65 Ser 80 TDM w 34 000 Ib axle exc 4 cyc Diesel 65 Ser 80 4 cyc Diesel w 18 000 Ib axle 6 50 7 60 ratio 65 66 Ser 60 TDM Diesel exc 28 000 Ib 2 Spd 67 70 Ser 60 w 18 500 34 000 lb axle 2303349 A R 22 55 left and right 18 teeth 16 splines Eaton 37072 64 66 Ser 80 23 000 lb axle exc 4 cyc Diesel left 68 70 Ser 60 w 23 000 Ib axle 612278A R 25 30 left and right Eaton 73339 65 66 Ser 60 4 cyc Diesel w 16 000 lb axle 5781577 2 21 20 66 70 Ser 50 60 w Chev 2 5 Spd axle 3873576 1 16 95 left 66 70 Ser 50 60 w Chev 2 Spd axle 3873577 1 16 95 right 5 529 GEAR ASSEMBLY Ring and Pinion not sold separately Part numbers appearingl in parenthesis are those of the ring gear an pinion respectively NOTE Axle ratio equals Ring Gear divided by Pinion 37 divided by 6 equals 6 17 to 1 41 55 Utility 1st Ser 55 59 Ser 4 w Sgl Spd axle 55 56 Ser 6 exc H D 60 61 Ser 40 1st design 63 66 Ser 50 w 11 000 Ib axle 67 68 Ser 40 exc 13 500 lb axle 604427 1 93 35 37 6T hypoid 3652522 3652549 46 55 2 Spd w vac shift Io ratio 1st Ser 2440755 1 96 25 23 8 l 3889M221 38900 289 Note 7 NOTE 7 When used w P Trac requires P Trac differential unit 3853552 Group 5 570 54 55 2 Spd w vac shift hi ratio 1st Ser 3707547 1 100 95 22 7 I 8889R252 3890S 331 55 Ser 5 exc 2 Spd 55 56 Ser 6 w H D 56 57 Ser 5 7 8 TDM SBC exc 2 Spd H D 57 Ser 6 62 66 Ser 60 2 cyc Diesel exc 2 Spd axle Tilt TDM 65 Ser 60 4 cyc Diesel w 5 7 000 Ib axle exc Tilt 65 Ser 60 Tilt 4 cyc Diesel 65 Ser 50 4 cyc Diesel w 15 000 Ib axle exi 2 Spd 67 69 Ser 50 60 Diesel 68 69 Ser 50 w 15 000 lb axle T 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATl0N P A 31S i REV 6 71 5 217 5 528 5 529 1971 CHEVROLET MOTOR DIVISION GENERAL MOTYDRS CORP REV 6 71 5 219 5 529 5 529