4 421 GEAR COUNTERGEAR UNIT Transmission Countershaft 60 ALL W 3 SPD 22 28 teeth 6257017 1 21 00 61 63 CORVAIR F C w 3 SPD 27 teeth Z 3772522 1 21 00 61 F C w 4 SPD lst design 33 teeth 3784644 1 23 00 61 63 CORVAIR W 4 SPD 61 63 F C w 4 SPD 2nd design 30 teeth 6257855 1 23 00 62 CHEVY w 3 SPD COUNTERGEAR UNIT w countershaft and bearing 27T 14T 22T 3817960 26 50 4 422 ROLLER SPACER WASHER Transmlssion Countershaft Gear 60 63 CORVAIR F C CHEVY w 3 SPD 1 8 dia x 3 4 long 435847 50 08 61 63 CORVAIR F C w 4 SPD bearing 7 64 die x 3 4 long 9414193 92 05 61 63 CORVAIR F C w 4 SPD SPACER bearing 3 25 32 0 L 7 8 O D x 23 32 I D 3775062 1 60 61 63 CORVAIR F C w 4 SPD WASHER bearing 7 8 O D x 23 32 I D 3775063 4 10 4 423 WASHER Transmission Countergear Thrust 60 63 CORVAIR F C CHEVY w 3 SPD 15 16 I D x 1 5 8 O D x 1 16 thk w tang 3845097 2 30 61 63 CORVAIR F C w 4 SPD 1 5 16 O D x 23 32 LD 3775060 2 25 4 428 SHAFT Transmission Counter 60 63 CORVAIR F C CHEVY vv 3 SPD 7 8 dia x 7 1 8 0 L 3707179 1 3 40 61 63 CORVAIR F C w 4 SPD 8 31 64 0 L x 45 64 thk 3775061 1 3 50 V 4 430 GEAR ASSY Transmission Reverse Idler 60 63 CORVAIR F C CHEVY w 3 SPD 3743358 A 1 10 05 61 63 CORVAIR F C w 4 SPD 3780111 1 8 45 ANOTE If clash is experienced in first gear also use 3725646 lst and reverse gear 4 431 BEARING Transmission Reverse Idler Gear Thrust 60 63 CORVAIR F C CHEVY w 3 SPD rear 1 13 16 0 D 34 rollers 457202 1 65 4 433 SHAFT Transmission Reverse Idler 60 62 CORVAIR F C CHEVY w 3 SPD 3 4 dia x 4 7 32 O L 590831 1 1 50 61 63 CORVAIR F C w 4 SPD 3 9 16 O L x 5 8 thk 3780887 1 1 65 63 CORVAIR F C CHEVY 3820058 1 1 50 4 435 PLUG PIN Transmission Reverse Idler Shatt 60 63 CORVAIR F C w 3 SPD bore seal 31 32 6256810 1 05 60 62 CORVAIR F C CHEVY w 3 SPD PIN lock 1 4 tapered x 11 16 long 590832 1 07 4 437 WASHER Transmission Reverse Idler Gear Thrust 60 63 ALL w 3 SPD rear 1 11 16 O D x 3 4 to 29 32 I D 3746442 1 10 62 63 CHEVY w 3 SPD front 49 64 I D 4 notches x 1 1 4 O D x 1 32 thk 591091 1 10 3 l 4 4 421 4 437 General Motors Corporation CORVAlR CH EVY