If you get underneath it and find the bars, the bolts are towards the center of the truck at the end of the bars. I think you can safely get about 2" out of cranking them down. If it's just a plow truck that doesn't get driven much, I think you can get 3" by cranking them down fully. If it's a driver I'd only do about 2" and get an alignment afterwards. For a plow truck, just crank them and roll. How big of a tire are you planning on running? I think a 31x10.5 r15 is the most common on these trucks with a little lift
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