4" lift and 325 75 16 tires are perfect IMO. I would not do 15's anymore.
You WILL break the 12 bolt in the K10 with the 406 and 35" tires. I've broken the Jimmy's 6 times. Depending on my finances the next time it breaks, it will get a semi-floater 9.5" 14 bolt where I can keep my existing 6 lug 15" wheels, but I would prefer to upgrade to 8 lug FF in the back.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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