68 70 Ser 10 thru 30 exc FFC 4 WD D D 3891527 1 1 05 inlet manifold 65 67 All 68 70 Ser 10 thru 30 3891525 1 65 inlet manifold one hose take off one V4 hose take off A 67 70 Ser 10 thru 30 3891526 1 75 inlet manifold 18 one hose take off 65 70 All Blazer 3891523 1 85 18 pipe thd one V hose take off 3 278 68 70 G 20 P G w Brake Booster 6 cyl 68 70 Ser 10 thru 30 exc D D 4 WD 3871227 1 1 65 ADAP I ER inlet manifold to air compressor 69 Ser 10 thru 30 Sgl Unit Cab P B w T H 400 C A C 396 exc 4 WD D D 70 Ser 10 thru 30 Conv w Brake Booster 396 3905372 1 90 FITTING ASSY vac inlet manifold 3 278 Not required in this group See group 3 278 3952329 85 FITTING ASSY 7 495 INSERT Spring Leaf 64 70 All w leaf spr 3935737 1 15 rear graphited polyethylene 2 sq in x Vu thk plastic 7 503 SPRING ASSEMBLY Rear LEAF TYPE 41 55 1st Ser exc SBC 604934 2 25 65 6 leaves auxiliary spring Note 1 NOTE 1 On 604934 spring rate can be increased from 1530 lb per in to 1800 Ib per in by addition of No 2 leaf 3657428 55 59 D D 2nd Ser 55 59 1 Ton w H D 2nd Ser 57 59 Ser 3G w 4 WD 60 66 Ser 20 4 WD w H D 60 66 D D exc 102 W B H D Aux Sprg 63 66 Ser 30 D D w Aux Spring 67 Ser 20 30 D D exc 1 1 000 Axle 3784271 2 54 65 8 leaves Note 2 NOTE 2 May be used together w aux spring 3720588 on 1 Ton models w hvy duty automatic or 4 Spd transmissions 55 59 D D 1 Ton w Dual Rear Wheels 2nd Ser 60 66 Ser 30 D D 1st design 3720588 2 28 60 5 leaves auxiliary spring 60 66 4 WD exc H D 2385697 2 39 50 6 leaves 60 68 Ser 30 exc D D H D Aux Sprg 11 000 Ib axle 68 Ser 20 D D 3763005 2 67 40 8 leaves 60 61 Ser 30 w H D 1st design exc D D 61 62 Ser 30 w Spec H D exc D D 3763006 2 70 95 10 leaves 2 stage 60 66 Ser 30 D D w Dual Rear Wheels 3894269 2 72 60 12 leaves 2 stage 61 68 Ser 30 w H D 2nd design exc D D 68 Ser 20 30 D D exc 1 1 000 lb axle 68 Ser 20 w 133 W B H D exc D D 3796040 2 58 50 8 leaves 2 stage 63 68 Ser 30 exc D D 68 Ser 30 D D 3794401 2 33 05 5 leaves auxiliary spring 63 66 Ser 10 20 exc D D 4 WD 3823083 2 24 00 3 leaves auxiliary spring 64 66 G 10 exc H D 3848680 2 33 9 5 6 leaves 64 66 G 10 w H D 3852060 2 39 00 7 leaves 65 67 Ser 30 D D 2nd design 3881576 2 27 00 5 leaves auxiliary spring 65 67 Ser 10 20 3907210 2 41 00 7 leaves 67 70 G 10 exc H D 3887732 2 42 40 2 leaves 67 70 G 20 w H D 3913140 2 76 85 3 leaves 67 68 Ser 10 20 4 WD exc H D 3888906 2 49 85 2 leaves 67 70 Ser 10 20 exc D D 4 WD 3888911 2 13 70 1 leaf auxiliary 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 31 REV 6 71 7 29 7 447 7 503