1 TURBOMYDRAMATIC TRANSMISSION I 1968 LIGHT DUTY TRUCKS SPEEDOMETER GEAR CHART I V I I I I 4 337 4 343 4 330 I REAR I GEAR GEAR 4 329 KEY AXLE REAR TIRE SIZE SPEEDO SPEEDO ADAPTER SPEEDO RATIO I DRIVEN DRIVE SPEEDO ADAPTER I TUR8Q HYDRAMATIC TRANSMISSION I I 3 07 8 15 x 15 exc 0 R I 8623310 1359270 I 3 07 7 00 x 15 0 R 6 50 x 16 7 00 x 17 5 O R 8623310 1359270 1565813 3 07 6 50 x 16 I 8623310 1359271 156581 I3 3 07 7 75 x 15 8 15 x 15 0 R I I 8623310 9774413 I3 07 7 00 x 15 I xc 0 R I 7 00 x 17 5 exc 0 R I 8623310 9774413 1565812 3 07 6 50 x 16 0 R 8623310 9780628 1565813 3 07 8 00 x 16 5 V 8623310 9780628 1565812 3 54 7 00 x 17 5 0 R 7 00 x 16 8 00 x 17 5 0 R 10 00 x 16 5 I 8623310 1359270 I 3 54 7 50 x 17 0 R 8623310 1359270 1565813 3 54 6 50 x 16 8 75 x 16 5 7 00 x 17 5 I 8623310 1359271 3 54 7 00 x 16 7 00 x 17 0 R I 8623310 9774413 3 54 7 50 x 17 8 00 x 19 5 8623310 9774413 1565812 3 54 8 00 x 17 5 9 50 x 16 5 8623310 I 9780628 F 3 73 II 6 50 x 16 0 R 7 X1 x 17 5 0 R 8623310 1359272 I 3 73 7 00 x 15 6 50 x 16 exc O IR 7 0 x 17 5 exc 0 R I 8623310 I 1359273 1 3 73 6 50 x 16 exc O R I 8 X1 x 16 5 8623310 1362048 A 3 73 7 75 x 15 8 15 x 15 0 R 8623310 1362195 II 3 73 8 15 x 15 I I 8623310 9780470 4 10 7 50 x 17 8 00 x 19 5 8623310 1359271 I 4 10 7 X1 x 17 0 R I 8623310 I 1359272 I 4 10 7 00 x 17 8623310 1359273 4 10 I 7 50 x 16 8623310 I 1362048 4 10 7 00 x 17 5 0 R 10 00 x 16 5 8623310 1362049 I 4 10 7 00 x 16 8 lX x 17 5 9 50 x 16 5 I 8623310 1362195 4 10 7 00 x 17 5 8 75 x 16 5 8623310 1362196 4 10 8 00 x 16 5 I 8623310 9780470 I 4 11 I6 50 x 16 0 R 7 00 x 17 5 0 R 8623310 1362049 4 11 7 00 x 15 7 00 x 17 5 8623310 1362196 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TL REV 5 79 I 4 149 4 337 4 337