56 59 Ser 8 10 3723826 8 10 front pin 60 62 Ser 40 3776180 2 75 SPACER torsion bar adj arm lower 7 447 ADAPTER Hose Not required in this group See group 3 278 3871227 1 65 Y 7 495 INSERT Spring Leaf 64 70 All w leaf spring 3935737 A R 10 graphited polyethylene plastic 2V2 x Via thk 7 503 SPRING ASSY Rear 38 40 Utility exc C O E 41 55 Utility 1st Ser exc SBC 604934 2 23 30 6 leaves auxiliary spring Note 1 NOTE 1 On 604934 spring rate can be increased from 1 530 Ib per in to 1 800 Ib per in by addition of No 2 leaf 3657428 55 59 Ser 4 exc SBC 3894271 2 63 20 10 leaves 55 59 Ser 4 SBC 3894269 2 66 00 12 Ieaves 2 stage 55 59 Ser 4 5 6 exc SBC 3720586 2 28 35 5 leaves auxiliary spring 60 62 Ser 50 60 7 500 Ib 3765401 2 114 50 9 Ieaves 1 radius leaf 2 spacers daub dark blue paint 60 66 TDM 17 250 lb exc H D 67 70 Ser 60 TDM exc 39 000 spring H D Sgl Spd axle 69 Ser 50 TDM w 34 500 rr spring 3773188 2 137 70 12 leaves 60 66 TDM w H D spring axle 67 69 Ser 60 TDM w 39 000 lb spring H D Sgl Spd axle 3780640 2 125 00 12 leaves 60 62 All 10 400 lb exc Tilt TDM 3765404 2 136 10 10 Ieaves 1 radius leaf 2 spacers daub yellow paint 60 Ser 60 thru 80 11 500 lb 61 62 Ser 60 70 exc Tilt TDM SBC 3765405 2 143 40 11 Ieaves 1 radius leaf 2 spacers daub orange paint 60 62 Tilt 11 500 lb low silhouette 3787805 2 128 35 11 Ieaves 1 radius leaf 2 spacers daub purple paint 60 66 Ser 60 thru 80 4 cyc Diesel 67 Ser 50 60 w aux spring 68 Ser 60 w 23 000 lb rear axle aux spring 69 70 T 5 6 aux springs w 17 000 lb rear axle 2453876 2 25 35 aux 4 leaf 3 63 65 Ser 60 w H D springs 63 66 Ser 50 exc 2 Spd H D rr spring 67 70 Ser 40 exc H D 13 500 rr axle 3818301 2 90 70 8 leaves 2 stage 63 66 Ser 50 w 2 Spd H D rr Spflhg 63 66 Ser 60 exc 17 000 lb axle Diesel A B H D rr spring 2 Spd 64 66 Ser 50 w Sgl Spd exc H D rr spring 65 66 Ser 50 4 cyc Diesel H D rr axle w 15 000 lb rear spring exc Tilt 65 66 Ser 60 TDM 4 cyc Diesel H D rr spring w 17 000 Ib axle 67 69 Ser 40 exc 17 500 Ib rear spring 67 69 Ser 50 exc H D spring TDM 70 Ser 50 15 000 lb rr spring w 15 000 lb rr axIe exc Air Brake T 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 315 7 443 7 503 7 44 REV 6 71