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The Firestone 2190 is a rear air spring kit designed to bolt into the factory rear suspension on select GM heavy-duty trucks, giving you adjustable air support to help level the truck when it's loaded down or towing a trailer.
It's built as a direct-fit kit for 1999-2005 GMC Sierra 2500 LD 2WD and 2001-2006 GMC Sierra 1500HD (except the 2004 model year), as well as the corresponding Chevrolet Silverado 1500HD/2500/3500 trucks.
If you're regularly towing a travel trailer with one of these trucks, this kit is a straightforward way to firm up the rear end and keep the truck riding level.
