I know LMC is a good source for our trucks, but you may want to check with Eibach Spring. They are in my opinion the best quality and are usually very helpful. They can also suggest a spring for towing, performance, ride quality, etc.
Doug  
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86 GMC SWB, DK. BLUE, ZZ430,TH400, 4.11'S, HEADMAN CERAMIC HEADERS, WELD BILLETS, BFG 275 / 60 / 15, 325 / 50 / 15 DRAG RADIALS, FIBERGLASS COWL HOOD, B&M SHIFTER. MSD, MARCH PULLEYS / ALT. / PWR. STEER PUMP, BECOOL RAD., BILLET GRILL & GRANT WHEEL.
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