1938 54 GEAR UNITS DRIVE DRIVENI TIRES OR l RING PINION SPEEDO SPEEDO GEAR YEARS M E S WHEEL SIZES GEAR TEETH ADAPTER GEAR No TEETR 38 40 Pass 6 006 16 4 and 6 ply 6 25 16 6 ply 41 11 None 602518 5 14 38 40 GC KA KH 5 50 18 4 and 6 ply 37 9 None 602518 5 14 49 52 Pass exc P G 6 70 15 4 and 6 ply 37 9 None 3695417 6 18 50 54 Pass W P G 5 13Teeth 5 70 15 4 ply 39 11 None 3704230 5 13 4 338 FITTING RETAlNER SEAL Speedometer Driven Geer 55 56 Pass 57 Pass exc P G 58 59 Pass w 4 Spd P G O D 60 Pass w P G O D 3708147 1 2 O L 58 Pass exc O D FRG 59 60 Pass exc O D P G 4 Spd 3748533 1 2 O L 61 64 Pass w P G 3 Spd exc H D 3869914 1 w seal 55 64 Pass 3708148 1 RETAINER gear fitting Via D 55 61 Pass w 3 Spd exc H D 57 61 Pass w 4 Spd 62 64 Pass 3708146 1 SEAL gear fitting O ring hole plug V l D 4 342 SHAFT ASSY SHAFT UNIT BRACKET Speedometer without Casing 38 Pass 53 54 Pass w P G 60 Pass w 3 Spd T G 6452122 1 66 38 48 Pass 53 58 Pass w P G O D 60 Pass w P G O D 4 Spd 1563561 1 68 Note 1 NOTE 1 For use with shaft assy 1588291 39 48 Pass 57 58 Pass w P G O D 61 62 Pass w O D 1563435 1 61V Note 2 NOTE 2 Production shaft only Not to be confused with Service Shaft 1563561 49 52 Pass exc P G 59 Pass w T G 63 64 Pass w 4 Spd 1564778 1 56I 50 52 Pass w P G 55 56 Pass w P G O D 1562669 1 63 53 55 Pass exc P G O D 56 Pass exc A T O D 58 Pass w T G 1970 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 30 it 4 337 4 342 4 30