V 3 SPEED TRANSMISSION 2 1968 LIGHT DUTY TRUCKS SPEEDOMETER GEAR CHART CONT D I 4 343 4 337 4 329 4 338 REAR GEAR GEAR AXLE TIRE SIZE AND TYPE SPEEDO SPE EDO ADAPTER FITTING RATIO I DRIVE DRIVEN SPEEDO ASSY I I H D 3 SPEED TRANSMISSION 396 3 54 7 00 x 17 3708144 3987918 3 54 7 50 x 17 O R 8 00 x 19 5 O R 3708144 3987918 1565812 I 3 54 7 00 x 17 5 O R 8 00 x 17 5 7 00 x 16 9 50 x 16 5 10 00 x 16 5 3708144 3987919 3 54 8 00 x 16 5 3708144 3987919 1565814 3 54 8 75x 16 5 3708144 3987920 3 54 7 00 x 17 5 6 50 x 16 3708144 3987921 1565812 3 54 7 50 x 16 3708144 3987921 1565813 3 54 7 50 x 17 8 00 x 19 5 3708144 3987921 1589247 I TRANSFER CASE 4 W D 3 73 7 75x 15 8 15 x 15 O R 2397307 I 2396889 3 73 8 15 x 15 exc O R I 2397307 3925669 2396889 3 73 7 00 x 15 6 50 x 16 8 00 x 16 5 7 00 x 17 5 2397307 3925671 2396889 4 57 7 00 x 16 O R 7 50 x 16 9 50 x 16 5 8 00 x 17 5 2397307 2396888 4 57 7 00 x 17 5 8 75 x 16 5 2397307 3925669 2396888 4 57 7 00 xv 17 exc 0 R 1 2397307 3925671 2396888 P K 4 57 7 00 x 17 O R 7 50 x 17 8 00 x 19 5 2397307 2396889 4 57 8 00 x 16 5 7 00 x 17 5 O R 2397307 2396890 4 57 7 00 x 16 8 00 x 17 5 2397307 392567 2396890 I I V I 1 I u 1 GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TL REV 5 79 1 4 15 4 337 4 337