Ring Pinion Speedo Speeao Years Models Tire or Wheel Sizes Geor Teeth Adapter Gear No 48 55 1lQ TON lst Ser 7 50 20 8 and 10 ply 37 6 1565812 3689121 48 55 1lQ TON lst Ser 10 00 18 12 ply 37 6 1565813 3689121 54 55 2 TON w 2 SPD lst Ser 7 50 20 10 ply 8 25 20 10 or 12 ply 8 86 and None 3689121 6 7 48 55 H TON lst Ser exc D D 15 6 and 8 ply 36 7 None 3689178 55 58 1 TON 2nd Ser exc D D 15 6 50 x 16 4 32 7 None 3689178 55 58 lg TON 2nd Ser exc D D 7 50 x 17 32 7 1565813 3689178 48 55 EQ TON D D lst Ser 7 50 17 8 ply 36 7 None 3689178 48 55 tj TON D D lst Ser 7 00 17 6 ond 8 ply 36 7 1565814 3689178 55 58 D D 2nd Ser 7 00 x 17 7 50 x 17 7 00 x 18 36 7 None 3689178 48 55 1 TON lst Ser 7 00 17 6 and 8 ply 36 7 1565814 3689178 48 55 1 TON lst Ser 7 50 17 8 ply 7 00 18 8 ply 36 7 None 3689178 55 58 1 TON 2nd Ser 7 00 x 17 8 ply 7 50 x 17 8 ply 7 00 x 18 8 ply 36 7 None 3689178 48 55 1lQ TON lst Ser 6 50 20 6 and 8 ply 7 00 20 8 and 10 ply 7 38 oxle ratio 38 7 None 3689178 48 55 ll Q TON lst Ser 7 50 20 8 and 10 ply 38 7 1565812 3689178 48 55 ALL w 2 SPD lst Ser 8 25 20 10 and 12 ply 9 00 20 10 ply 8 10 and None 3689178 6 13 48 55 2 TON lst Ser 8 25 20 10 and 12 ply 9 00 20 10 ply 37 6 None 3689178 56 58 lj TON exc D D 7 x 17 5 A 32 7 None 3689178 56 58 1 TON exc D D 8 x 17 5 32 7 1565812 3689178 56 58 lj TON exc D D 8 x 19 5 32 7 1565813 3689178 56 58 D D 1 TON 8 x 19 5 36 7 None 3689178 48 55 ALL w 2 SPD lst Ser 7 50 20 8 10 and None 3689179 6 13 48 55 ALL wr 2 SPD lst Ser 10 00 18 12 ply 8 10 andl 1565812 3689179 6 13 48 55 2 TON lst Ser 53 55 1 lg TON lst Ser 7 50 20 8 25 20 37 6 None 3689179 56 58 1 TON 8 x 17 5 8 ply 36 7 None 3689179 54 55 l Q TON lst Ser 6 00 x 16 6 ply 55 58 l Q TON 2nd Ser 15 6 50 x 16 6 ply 39 10 None 3707598 56 58 l TON 7 x 17 5 39 10 1565812 3707598 57 58 ALL w 4 WD 7 x 17 5 6 6 x 17 5 8 x 19 5 32 7 1565812 3745935 1565813 57 58 4 WD 8 x 17 5 8 ply 8 x 19 5 36 7 None 3745936 57 59 4 WD 6 50 x 16 6 70 x 15 7 x 17 5 8 x 17 5 39 10 None 3745934 11565812 58 1 TON 8 x 17 5 8 ply 58 D D 7 x 17 5 8 x 17 5 6 and 8 ply 36 7 None 3689179 58 59 l Q TON 6 70 15 6 50 16 6 ply 37 10 None 3752392 58 l TON 7 00 17 5 8 00 17 5 37 10 1565812 3752390 59 lg TON 7 x 17 5 37 10 None 3752390 59 lg TON 15 x 5 50 37 10 None 3752390 59 Ser 3E 8 x 19 5 32 7 None 3760340 59 Ser 3E 8 x 17 5 7 50 x 17 32 7 None 3760341 59 D D 1 TON 8 x 19 5 15 x 5 50 36 7 None 3760342 59 D D 1 TON 7 x 17 5 36 7 None 3760343 59 lj TON 6 70 x 15 39 10 None 3707598 59 lj TON 15 x 5 50 39 10 None 3707598 59 4 WD 15 x 5 50 7 x 17 5 6 50 x 16 32 7 None 3760358 59 4 WD 7 x 17 5 8 x 17 5 36 7 None 3760359 59 4 WD 15 x 5 5 7 x 17 5 8 x 17 5 39 10 None 3760517 59 4 WD 8 x 19 5 7 00 x 17 7 00 x 18 7 50 x 17 36 7 None 3760358 59 4 WD 8 x 17 5 7 00 x 17 7 50 x 17 32 7 None 3760357 59 4 WD 8 x 19 5 32 7 None 3760356 60 63 Ser 10 exc 4 WD 6 00 x 16 6 50 16 6 70 15 7 10 x 15 39 10 None 3707598 60 63 Ser 10 exc 4 WD 6 00 x 16 6 50 16 6 70 15 7 10 x 15 7 x 15 5 8 x 17 5 7 00 x 15 7 50 x 15 15 x 6 44 13 None 3752390 60 63 Ser 10 exc 4 WD 6 50 x 16 7 x 17 5 8 x 17 5 7 00 x 15 7 50 x 15 15 x 6 39 10 None 3752392 4 337 724 C M 2 General Motors Corporation