The Konis are not adjustable I take it.

From what I have seen, most lowering kits lower the rear more than the front. why this is I do not know, .. but every lowered Sierra I have seen has had the ass draging look.
might be just the way it is. It could also be that because the springs sat uncompressed for awhile they are holding the car up. give it about a week and see if it settles down some. also if youhave any "Ice" in the trunk the rear will sit lower.

picture please.


TF