Timbren FRTT1525 SES Suspension Enhancement System Rear Severe Service Kit

The Timbren FRTT1525 SES Suspension Enhancement System is a rear axle helper spring kit engineered for heavy-duty hauling and towing applications. Featuring Timbren's patented Aeon® hollow rubber springs, this severe service kit bolts directly to your existing suspension to deliver increased load support and improved stability under demanding loads — without affecting ride quality when unloaded.

How It Works:

The Aeon® rubber springs feature a progressive spring rate, meaning support increases proportionally as load weight increases. With a built-in clearance gap of ½" to 1½" when unloaded, the springs remain disengaged during normal driving and only engage when the suspension compresses under load. The result is a factory-like ride when empty and confident, level handling when loaded.

Key Features:

• 7,000 lb. capacity per pair — designed for severe service applications such as slide-in truck campers, snow plows, salt spreaders, and commercial use
• Patented Aeon® hollow rubber springs — made from 100% natural rubber with a progressive spring rate for smooth, responsive load support
• Eliminates suspension sag, body sway, and rear squat under heavy loads
• Works in conjunction with factory leaf springs — no replacement of existing suspension components required
• No air lines, no pressure checks, no maintenance required — a true set-it-and-forget-it solution
• Solid rubber construction cannot be punctured or deflated unlike air bag alternatives
• Installs with basic hand tools and requires no drilling — typical installation under 30 minutes
• Improves roll stability, steering response, and reduces brake and tire wear when loaded
• Backed by a lifetime warranty covering defects in material and workmanship for the life of the vehicle

The FRTT1525 is a rear axle, severe service kit intended for 2WD and 4WD applications. It is specifically designed for top-heavy configurations that demand maximum stability. Note: Adding this kit increases the effective spring rate but does not increase the vehicle's GVWR — always ensure total load remains within the manufacturer's rated Gross Vehicle Weight Rating.