How reliable is the GearVendors overdrive? I won't be towing much, but like the idea of have to choose between what gears you have. Will it last as long as the truck if taken care of? Any recommendations on a set of airbags would be great. Looking for a set that adjust the height when loaded, but keep the stock leafs and overload springs. Are the firestone air bags any good? What about a big rig type of setup?
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