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I'm planning on getting some new tires for my 05 Sierra CC. Stock front, plan on removing the rear block to get it closer to level. Possibly add drop shackles in the future, but no lower than that.

I currently have 275/55/20, i'm looking at either 275/60/20 or 305/50/20. Just a highway tread/very light AT tread pattern. Maybe Cooper Discoverer HT, Nitto 420, Toyo Proxes, etc.

Will either of these sizes fit with just the rear block removed? They are on stock GMC 20's.

Thank you.
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