I have a 88 1500 with a 4.3L and a 5spd manual. What was the tipical gear ratio of this combo? I hav...

3.23 or a 3.43 gear, If you call a chev dealer, they can run a VIN check and let you know, this is a free service

Check in your glove compartment for the option codes. Look for one of these codes:

GH0 AXLE REAR, 3.54 RATIO
GH2 AXLE REAR, 2.29 RATIO
GH3 AXLE REAR, 2.77 RATIO
GH4 AXLE REAR, 2.92 RATIO
GK9 AXLE REAR, 4.63 RATIO
GL3 AXLE REAR, 6.17 RATIO
GM1 AXLE REAR, 2.59 RATIO
GM3 AXLE REAR, 3.45 RATIO
GM8 AXLE REAR, 2.56 RATIO
GQ1 AXLE, STD RATIO
GS4 AXLE REAR, 3.70 RATIO
GTY AXLE, WIDE TRACK
GT4 AXLE REAR, 3.73 RATIO
GT5 AXLE REAR, 4.10 RATIO
GT7 AXLE REAR, 3.33 RATIO
GT8 AXLE REAR, 4.10 RATIO
GU1 AXLE REAR, 2.41 RATIO
GU2 AXLE REAR, 2.73 RATIO
GU4 AXLE REAR, 3.08 RATIO
GU5 AXLE REAR, 3.23 RATIO
GU6 AXLE REAR, 3.42 RATIO
GV2 AXLE REAR, 5.83 RATIO
GV4 AXLE REAR, 3.36 RATIO
GV8 AXLE REAR, 2.72 RATIO
GW4 AXLE REAR, 3.31 RATIO
GW6 AXLE REAR, 3.27 RATIO
GW9 AXLE REAR, 2.93 RATIO
GX3 RATIO,TRANSAXLE FINAL DRIVE 3.33
GYS RATIO TRANSAXLE FINAL DRIVE 3.65
G44 AXLE REAR 3.07 RATIO
G5O SPRING REAR, HEAVY DUTY, VAR 1
G51 SPRING REAR, HEAVY DUTY, VAR 2
G52 SPRING, RR, 15000 LBS
G60 SPRING REAR, AUXILIARY
G66 LEVEL CONTROL, MAN, AIR
G67 LEVEL CONTROL, AUTO, AIR
G69 LEVEL CONTROL, AUTO, AIR, HD
G72 AXLE REAR, 2.14 RATIO
G75 AXLE REAR, 3.62 RATIO
G80 AXLE POSITRACTION, LIMITED SLIP
G87 RING GEAR, 8.50 INCH
G89 RING GEAR, 7.50 INCH
G92 AXLE REAR RATIO, PERFORMANCE
G9S AXLE REAR RATIO, ECONOMY