'97 4x4 Tahoe sitting low in rear end

I have a '97 Tahoe 4x4 and the ride height in the rear seems to be a little to low. I dont know if im just imagining this or if it is a problem. I
have seen several on the road that looked to be normal. I didnt know if the leaf springs were just wearing out or what. Please let me know if you have any info on this and if you know how to fix it cheap without putting blocks in it.
Thanks Brian
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