3 SPEED TRANSMISSION 60 61 Ser 10 20 w 3 Spd exc H D 4 WD 62 63 Ser 10 20 w 3 Spd exc A H D 3855 709 1 20 40 EXTENSION ASSY w bushing cast 3707195 Note 1 NOTE 1 On models prior to 1963 it will be necessary to use speedometer fitting 3748533 in group 4 338 64 66 Ser 10 20 w 3 Spd exc H D O D 67 Ser 10 20 w Muncie 3 Spd exc O D 68 Ser 10 Conv w Muncie 3 Spd 250 exc O D 68 Ser 10 20 4 WD w Muncie 3 Spd 3844356 1 15 90 EXTENSION ASSY 64 65 G 10 w 3 Spd 3846284 1 24 30 EXTIENSION ASSY 68 Ser 10 20 w H D 3 Spd 3893603 1 43 15 EXTENSION ASSY Warner AT16 7A 66 69 G 10 20 vv 3 Spd 3887016 1 25 20 EXTENSION ASSY 67 70 Ser 10 20 w Saginaw 3 Spd exc 4 WD 0 D 3873885 1 20 40 EXTIENSION ASSY 69 Ser 10 20 w Muncie 3 Spd exc 4 WD 3911983 1 20 90 EXTIENSION ASSY 70 Ser 10 20 w Muncie 3 Spd exc 4 WD 70 G 10 20 w Muncie 3 Spd 3968043 1 21 20 EXTlENSlON ASSY 48 53 Comm w 3 Spd 54 V2 Ton w 3 Spd 591633 1 4 80 SUPPORT ASSY 1 D cast 591634 54 1 Ton w 3 Spd 3845019 1 14 15 SUPPORT ASSY Wu D Not required in this group See group 5 387 1456254 15 WASHER 4 318 GASKET SEAI Transmission Rear Elearing Retainer 54 66 All w H D 3 Spd 3846089 1 25 55 65 All w 3 Spd exc O D H D 66 Ser 10 20 w 3 Spd exc A H D O D 67 Ser 10 20 w Muncie 3 Spd exc O D 68 Ser 10 w 3 Spd 250 exc D D O D 68 Ser 10 20 4 WD w 3 Spd 3707172 1 05 extension 5 holes l D 68 Ser 10 20 w H D 3 Spd 3870807 1 25 extension Warner T16 145 66 68 Ser 10 w O D 66 70 G 10 20 w Saginaw 3 Spd 67 70 Ser 10 20 w Saginaw 3 Spd 3876752 1 10 extension 69 70 Ser 10 20 w Muncie H D 3 Spd 391 I943 1 25 trans ext 70 Ser 10 thru 30 exc T H 39312255 1 2 90 SEAL extension oil 55 66 All w H D 3 Spd 37659588 1 2 00 SEAL ASSY oil 2 Vaz l D x 3 O D x Vu thick 55 61 V Ton w D D SEAL ASSY overdrive case 55 59 V2 V4 TOR 60 65 Ser 10 20 w 3 Spd exc H D 66 69 All 3871649 1 2 95 extension of oil 4 329 ADAPTER Speledometer NOTE For detailed application use speedometer gear charts 48 55 Ton 1st Ser exc FR 1580273 1 22 74 ratio 15 17 w 15 6 and 8 ply tires 55 V4 Ton w 3 Spd H D 2nd Ser exc D D ratio 18 14 w 7 00 17 6 and 8 8 x 19 5 tires 57 58 Ton exc D D 1583876 1 22 74 7 00 x 17 6 8 ply tires 63 67 Ser 10 3 07 axle ratio 17 14 w 6 50 16 7 00 15 or 7 17 5 8 00 x 16 5 8 15 x 15 0 Fl 6 ply tires 68 For application refer to chart in group 4 337 1563967 1 22 74 68 For application refer to IA l chart in group 4 337 3925669 1 13 85 ADAPTER ASSY 68 For application refer to chart in group 4 337 3925671 1 13 50 ADAPTER ASSY 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATl0N P A 31 i REV 6 71 4 39 4 317 4 329