You could probably squeeze them on with the existing lift, but if you want to go proportional, two more inches of lift is ideal. But, youdon't say what axles you have, and 35" tires with a dana 30/35 is probably a bad idea, unless it's mostly street driven.
what he said...the 35 rear is a bad seed...and you could fit the 35's right now as people run 35's with 4 inch lifts but you will rub at full flex. if you go with any more lift you will definitely want to go with an sye and a new driveshaft
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