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.