Update your semi's spring-operated door assembly with increased reliability and smoothness, with the Whiting 93" Aluminum Roll Up Door Shaft for #2376 Balancer that ensures you're Ready for the Road Ahead™. This replacement shaft holds your balancer in place, so that your vehicle's roll up door can open and close with ease. Fashioned with rust and corrosion-resistant metals for extended use in rugged climates and harsh conditions. FleetPride is your First Click in Heavy Duty®.