will a lift kit from a 1975 K10 work on a 1971 K5

[Richard]

Always remember the Blazers of any year squatting in the rear with a lift. Think the truck springs are included in the off the shelf mainstream lifts, but Blazers are heavier in the rear. Old quick fix was to use an add a leaf to get the rear up. Firm ride was the consequences of that. Personally, I like the look of back squatting a bit on a 4x4. To each their own.