Join Date: Mar 2010
Location: Wentzville, Mo.
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Consider maybe trading for the correct year.
Or run the offset wheels.
Do you have over 5/8" clearance now? I would say minimum should be 1/2" or 5/8" after you install the new rear so you should have at least 1 1/8" per side now or you'll chance rubbing.
You could "roll" the fenders to gain additional clearance. Many will "poo poo" this idea but if done right it will not damage your paint and be virtually unnoticeable.
So I would measure first and then decide if you don't have enough clearance to-
1. Trade the rear.
2. Offset wheels.
3. Roll or clearance fenders.
4. Keep your stock rear and upgrade the axles, diff and gears to be damn near as stout as a stock 12 bolt. Remember......stock 12 bolt Chevy's have their weak points too.