S 3 SPEED TRANSMISSION 4 317 EXTENSION ASSY WASHER Transmission Rear Main Bearing I NOTE Overdriveextensions are integral with 0 D case Group 4 455 2 55 65 5 Ton w 3 Spd H D 591674 1 cast 591673 4 55 59 z Ton w 3 Spd exc O D I I l D 60 61 Ser 10 20 w 3 Spd exc H D n 4 WD 62 63 Ser 10 20 w 3 Spd exc H D 3855709 1 EXTENSION ASSY w bushing cast I 3707195 Note 1 NOTE 1 On models prior to 1963 it will be necessary to use speedometer fitting 3748533 in group 4 338 67 70 Ser 10 20 w Saginaw 3 Spd l i exc 4 WD 0 D 71 72 AII Blazer w Saginaw 360002 1 EXTENSION ASSY 69 70 Ser 10 20 w Muncie 3 Spd 4 exc 4 WD I A 70 G 10 20 w Muncie 3 Spd l 71 72 All w Muncie 6273258 1 EXTENSION ASSY Not required in this group See group 5 387 1456254 WASHER L 4 318 GASKET SEAL ASSY Transmission Rear Bearing Retainer 55 65 All w 3 Spd exc 0 0 H D I Q 66 S3 10 20 w 3 Spd exc H D 0 67 Ser 10 20 w Muncie 3 Spd U exc OLD R i 68 Ser 10 w 3 Spd 250 exc D D O D 68 Ser 10 20 4 WD w 3 Spd 3707172 1 extension 5 holes n l D 66 68 Ser 10 w O D V K A 66 70 G 10 20 w Saginaw 3 Spd 67 70 Ser 10 20 w Saginaw 3 Spd 71 72 All Blazer w Saginaw 3876752 1 extension 69 70 Ser 10 20 w Muncie H D 3 Spd 71 72 All w Muncie 3911943 1 trans ext rf 55 66 All w H D 3 Spd 3769588 1 SEAL ASSY oil 2 u I D x 3 0 0 x thick V 55 61 Ton w D D SEAL ASSY overdrive case 65 59 Ton V 4 60 65 Ser 10 20 w 3 Spd exc H D I 66 72 AII t 1243402 1 extension of oil L I 4 319 BUSHING Transmission Extension 65 72 All 6260048 1 1 I D x A1 i O D 4 329 ADAPTER Spaedometer 9 NOTE 1 Above adapters used as required in combination with speedometer gears to correct odometer reading for various tire sizes transmission and rear axle gear ratio combinations See Group 4 33 7 NOTE For detailed application use speedometer gear charts l 55 Ton w 3 Spd H D 2nd Ser A exc D D Z ratio 18 14 w 7 00 17 6 and 8 8 x 19 5 tires l 57 56 Ton exc D D r 1583876 1 7 00 x 17 6 8 ply tires 63 67 Ser 10 3 07 axle T ratio 17 14 w 6 50 16 7 00 15 or 7 17 5 8 00 x 16 5 8 15 x 15 0 R 6 ply tires 6B For application refer to chart in group 4 337 1589247 1 68 72 For application refer to chart in T group 4 337 3925669 1 ADAPTER ASSY stamped 9444 W q 66 72 For application refer to chart in group 4 337 l 3925671 1 ADAPTER ASSY stamped 1 0500 U 68 For application refer to chart in A 4 337 group 1583624 1 ADAPTER ASSY l 69 72 For application refer to chart in 4 337 group 3950346 1 ADAPTER ASSY stamped 1 2020 X 69 72 For application refer to chart in I 4 337 group i I 3950350 5 1 ADAPTER ASSY stamped 1 3000 J 69 72 for application refer to chart in 4 337 group 3950352 1 ADAPTER ASSY stamped 8241 C 69 72 For application refer to chart in i 4 337 group 3950354 1 ADAPTER ASSY stamped 9743 Y 1 69 72 For application refer to chart in Group 4 337 3905497 1 ADAPTER ASSY stamped 8000 T GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TL N REV 5 79 I 4 11 4 31 7 4 329