Can you stack lifts? Yes.
Should you? No.
Suspension geometry and wheel travel have a lot to do with why you shouldn't stack lifts. Generally speaking, people will do a 6" suspension, and then throw a 2" leveling spacer on the truck for an effective 8" lift; which it sounds like you are trying to do. I will link to a discussion ->
https://www.ramforum.com/threads/lif...l-stack.96691/ that goes over the technicals about this.
The question I have is, what are you trying to accomplish? Are you just simply looking to go from a 6" to a 8" lift? The general recommendation if you are just looking for extra height is to opt for a body lift vs. stacking suspension lifts.
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