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Actually, 67-70 1/2 ton 2WD trucks were all 6 lug, 67-70 3/4 ton 2WD trucks came either 6 or 8 lug. These were all 4 wheel drum brake though. Starting in 1971 GM used 5 lug on the 1/2 ton with disc brakes and 8 lug on the 3/4 ton trucks with disc brakes.