3 SPEED TRANSMISSION 4 I 4 342A SHAFT ASSEMBLY with Casing C0n t I i 57 59 All w 4 WD I I 62 4 WD 2nd design I as as Au i t 67 69 Ser 10 D D 6478134 1 92 Z casing 67 69 Ser 10 thru 30 exc D D 4 WD 3915561 1 68 L 68 69 Ser 10 thru 30 exc speed t control D D 4 WD 6476986 1 I flex L J I 68 70 G 10 20 3914974 1 I 130 casing Length AC Number t 70 72 Ser 10 thru 30 exc D D 6478120 31 to 34 CC 313 70 72 All 6478121 35 to 40 CC 304 I 70 72 All 6478122 40 to 44 CC 505 70 72 All 6478123 45 to 48 CC 506 70 72 All I 6478124 I 49 to 52 507 I V I 38 72 All 6480250 52 to 56 508 4 I 70 72 All 6478129 68 to 72 512 70 72 AlI 6478130 72 to 76 CC 513 4 70 72 All Q 6478132 80 toI84 CC 515 I 71 72 G 10 thru 30 I 6480377 1 110 O L I 4 71 72 D D 25032283 1 100 O L 71 G 10 thru 30 6491006 1 CLIP spring instr cluster cable release I I 4 3428 Speed and Cruise Control Shaft Assys I 68 69 Ser 10 thru 30 6476986 1 w casing regulator to trans l I 4 343 GEAR Speedometer Drive V I NOTE For detailed application use Speedometer Gear Chart i 63 66 Ser 10 thru 30 w 4 11 4 57 V 1 5 14 axle i 63 66 Ser 10 w 3 73 axle I 6 00 16 6 70 15 7 10 15 tires I 59 61 Ton w econ axle 3 38 3708145 1 8 teeth 1 0 0 x thick 63 66 Ser 10 w 3 07 axle 63 66 Ser 10 w 3 73 axle exc 6 00 I 1 6 6 70 15 7 10 15 tires 6 95 x 14 tires A 68 I Ser 10 20 w H D 3 Spd 3708144 1 8 teeth 4 55 62 z Ton w 3 Sptk exc H D 0 D 3845073 1 7 teeth 1 u 0 0 x 4 thick I 55 58 4 Ton w 3 Spd exc H D 3845079 4 I 6 teeth 1 M 0 0 x thick I 68 70 For application refer to chart in I K group 4 337 I 6261 795 1 8 teeth 68 For application refer to chart in g I group 4 337 I 6261794 1 8 teeth F l 68 For application refer to chart in I 4 337 group 3866663 Y1 I 69 Blazer exc T H 35 0 3964593 1 6 teeth I I 69 70 For application refer to chart in i group 4 337 6261785 1 69 70 For application refer to chart in I group 4 337 6261077 1 8 teeth black I 69 70 For application refer to chart in I group 4 337 6261078 1 8 teeth orange 4 345 CLIP Speedometer Drive Gear I I 71 72 All Blazer Q 6261781 1 drive gear retainer V 4 351 I GEAIR Transmission Main Drive Clutch I I I NOTE 1 Can be used to correct high gear disengagement on 1949 52 models but also requires 1 ea I 591 851 591852 spacers 24 7450247 rollers and 1 3699259 mainshaft 40 52 All w 3 Spd 609320 1 19 helical teeth shift dia 1 az 9 i 1 A 0 L 53 54 Comm w 3 Spd 2nd design exc H D 3705067 1 I 19 helical teeth shaft dia 9 tt 0 L 55 59 Ser 3 w 3 Spd exc H 0 V 60 66 Ser 10 20 w 3 Spd exc H D I 0 0 I 67 Ser 10 20 w Muncie 3 Spd V exc 0 0 I K I I I 68 Ser 10 Conv w Muncie 3 4 I A Spd 250 exc 0 0 H D I I 68 Ser 10 20 4 WD w Muncie 3 I Spd exc H D 3752836 1 V w synchronizer spring Note 2 NOTE 2 When using on 1957 and prior models retainer 3741458 must be used 64 65 G 10 w 3 Spd I 64 65 Ser 10 w 0 0 exc D D 3848101 1 w synchronizer spring 19 teeth i GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72Tl REV 5 79 4 37 I 4 342 4 351