i have a quick question, i have a 1988 suburban and i have a set of 4" lift springs for a 1977-1987 truck, will these springs work or not? and why?
he means length difference.

Maybe I'm misreading the question, I thought he was asking if a set of springs that were listed for use on 77-87 "trucks" would work on his Sub, even though it's an 88.
Like I said, front springs, for sure, rear springs , depends on the truck ( 1/2 , 3/4 , or 1 ton) to determine the length of the springs.
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So do you think they will work? Are the springs different after 1987?