Timbren ASR35HDSLH 3500 Lb. Heavy-Duty Active Suspension Response System Left-Hand

The Timbren ASR35HDSLH is a 3,500 lb. heavy-duty left-hand Active Suspension Response (ASR) suspension enhancement unit designed to eliminate sag, improve load stability, and reduce body roll on trucks, vans, and SUVs. Timbren's ASR technology uses hollow, progressive-rate rubber springs (Aeon® rubber helper springs) that work in parallel with the existing factory suspension — activating only under load and remaining completely silent and maintenance-free when unloaded.

Key Features:

• 3,500 lb. heavy-duty rating — engineered for demanding towing and hauling applications
• Left-hand (LH) unit — sold individually; designed for direct driver-side installation
• Progressive-rate Aeon® hollow rubber spring — provides a firm, controlled response that increases resistance as load increases
• No-sag performance — maintains proper vehicle ride height under maximum payload or tongue weight
• Maintenance-free design — no air lines, fittings, compressors, or fluid required
• Bolt-on installation — mounts using existing factory hardware locations; no drilling required on most applications
• Fully compressed bump stop protection — prevents metal-to-metal contact during extreme suspension travel
• All-weather durability — Aeon® rubber compound resists UV, ozone, heat, and cold

Timbren ASR suspension enhancement systems are a trusted upgrade for drivers who regularly haul heavy loads, tow trailers, or operate work vehicles where payload stability and consistent ride height are critical. The ASR35HDSLH is the left-side component and is typically paired with its right-hand counterpart for a complete axle installation.