orrum
New Member
Had a 1985 GMC 3+3 454 dually n the running boards had a pipe in them that were air tanks. U want to air up the front tires for hauling a load u attach a air hose n pump them up. U had to refill at a gas station. That truck drove great with low pressure in the front tires. Dont know where they came from, were on it when I got it from a dealer, who told me what they were for. You sooty greasey GM wrenchers come up with unique solutions. Paul great that ya got your truck back and rolling pardner!!!!! CONGRATULATIONS!!!!