4 GM09 090 l 19 9 172 SWITCH FAN KIT INCLS 18 20 20 9 172 RETAINER SW RR CMPR HD I 21 I 9 178 VALVE PRESS REL 22 8 927 O RING RELIEF VALVE 1 23 9 188 KEY CLUTCH HUB 1 24 9 170 O RING CYL D SCHARGE 1 25 9 170 SEAL KIT SHAFT BEGINNING W 1984 2ND DES 2 NOTE 1 GROUP 9 175 RING SEAL KIT 2724281 INCLUDES 9 14 18 22 24 NOTE 2 1ST DES 6599114 USED IN ALL MODELS PRIOR TO 1984 81 1984 ASM NUMBERS 1131400 1131407 1131409 1131413 2ND DES 2724319 USED IN ALL OTHER 1984 ASSEMBLIES 81 LATER 1991 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17A 5 91 9 11 9 000 GROUP