Ring Pinion Speedo Speedo Years Models Tire or Wheel Sizes Gear Teeth Adapter Gear No 50 54 PASS w P G 53 55 CORVETTE 6 cyl 5 13 teeth 6 70 15 4 ply 39 11 None 3704230 53 54 PASS exc P G 4 11 teeth 6 70 15 37 10 None 3702814 54 I Q TON 6 00 x 16 6 ply 39 10 None 3709359 54 55 M TON w HD lst Sex 6 00 x 16 6 ply 36 7 None 3692234 55 57 lg TON w H D l5 6 70 x 15 6 50 x 16 6 ply 39 10 None 3707598 55 58 M TON w HD 2nd Ser exc D D 7 00 x 17 32 7 1583876 3689121 55 58 M TON w H D 2nd Ser exc D D 15 6 50 x 16 32 7 None 3689178 55 58 TON w HD 2nd Ser exc D D 7 50 x 17 32 7 1565813 3689178 55 58 D D w HD 2nd Sen 1 7 00 x 17 7 50 x 17 7 00 x 18 36 7 None 3689178 55 58 1 TON w HD 2nd Ser 7 00 x 17 8 ply 7 00 x 18 8 ply 7 50 x 17 36 7 None 3689178 58 59 TON w H D 7 x 17 5 15 x 6 ply 6 70 x 15 6 50 x 16 15 x 5 50 39 10 1565812 3707598 56 58 M TON w HD exc D D 7 x 17 5 32 7 None 3689178 56 58 TON w HD exc D D 8 x 17 5 32 7 1565812 3689178 56 58 TON w H D exc D D 8 x 19 5 32 7 1565813 3689178 56 58 D D 1 TON w H D 8 x 19 5 8 ply 36 7 None 3689178 56 58 1 TON w H D 8 X 17 5 8 ply 36 7 None 3689179 58 D D w HD 7 x 17 5 8 x 17 5 36 7 None 3689179 58 59 1 Q TON w HD 6 70 15 6 50 16 6 ply 15 x 6 ply 37 10 None 3752392 58 59 lj TON w H D 7 x 17 5 8 x 17 5 39 10 None 3752392 58 59 lf TON w HD 7 x 17 5 8 x 17 5 15 x 5 50 37 10 None 3752390 59 Ser 3E w H D 8 x 19 5 32 7 None 3760340 59 Ser 3E w H D 8 x 17 5 7 50 x 17 32 7 None 3760341 59 Ser 3E w H D 7 x 17 5 6 50 x 16 15 x 5 50 32 7 None 3760342 59 D D 1 TON w HD 8 X 19 5 7 00 tx 17 7 50 x 17 7 00 x 18 36 7 None 3760342 59 D D 1 TON w HD 7 x 17 5 8 x 17 5 36 7 None 3760343 60 63 Ser 10 w HD 6 00 16 6 50 16 7 17 5 8 17 5 7 00 15 6 70 15 7 10 15 7 50 15 15 x 6 ply 39 10 None 3752392 60 63 Ser 10 w HD 6 00 x 16 6 50 16 6 70 15 7 17 5 8 17 5 7 00 x 15 7 10 x 15 7 50 x 15 44 13 1565813 3752390 60 63 Ser 10 w HD 6 00 x 16 6 50 16 6 70 15 7 10 x 15 39 10 None 3707598 60 63 Ser 20 w HD 8 19 5 7 50 x 17 32 7 None 3760340 60 63 Ser 20 w HD 8 17 5 7 00 x 16 7 00 x 17 7 50 x 15 32 7 None 3760341 60 63 Ser 20 w H D 6 50 16 7 17 5 7 00 x 15 15 x 6 32 7 None 3760342 60 62 Ser 30 w HD 7 17 5 8 17 5 7 00 x 15 7 50 x 15 7 50 x 16 15 x 6 6 50 x 16 7 00 16 36 7 None 3760343 60 63 Ser 30 w H D 8 19 5 7 00 17 7 50 17 7 00 18 7 50 16 36 7 None 3760342 63 Ser 10 w HDD 6 00 16 6 50 16 6 70 15 7 00 15 7 10 15 7 50 15 7 17 5 8 17 5 43 14 1565813 3752390 63 Ser 30 D D w HD 6 50 16 7 00 16 7 00 18 7 50 16 8 19 5 7 50 17 35 6 None 3760343 Commercial and Utility Trucks equipped with 4 Speed Tronsxnission 38 47 S T V VV Y M OR OS OW OY Pl PK PL Ol OK QL 6 00 20 6 and 8 ply 30 x 5 6 und 8 ply 37 6 1565814 603074 38 47 S T V W Y M OR OS OW OY 6 50 20 6 ply 7 00 20 8 ply 32 x 6 P PK PL Ol OK QL 8 und 10 ply 32 x 7 10 ply 37 6 None 603074 38 47 S T V W Y M OH OS OW OY P1 PK PL Ol OK OL 7 50 20 8 ply 37 6 1565812 11565813 1 603074 39 42 V W Y M w 2 SPD 8 25 20 10 ply 8 22 and 1565812 1 603074 6 17 1 606431 1 48 53 lg TON 5 50 15 6 and 8 ply 6 00 16 6 ply 6 50 16 6 ply 37 9 Noiue 3689223 48 55 M TON lst Ser exc D D 7 00 17 6 and 8 ply 32 7 None 3689223 48 55 1 TON lst Ser exc D D 7 50 17 8 ply 32 7 1565812 3689223 48 55 fl TON lst Ser exc FR 5 50 15 6 and 8 ply 36 7 None 3689121 55 58 M TON 2nd Ser exc D D 7 00 x 17 32 7 1583876 3689121 8 3FfE Mm 72 4 337 General Motors Corporation