Tuff Country 97037 Block & Ubolt Kit - 5 1/2" (H) x 2 1/2" (W) x 5 1/4" (L) Tapered

The Tuff Country 97037 Block & U-Bolt Kit is a bolt-on rear lift solution designed for 4WD GM trucks, specifically the GMC Suburban and related Chevy/GMC models from the late 1980s through the 1990s. It provides a true 5.5-inch rear lift with a ride that stays true to factory intent, helping you achieve a tougher stance and added clearance.

• Rear lift height: 5.5 inches of additional rear ride height to enhance stance and accommodate larger tires.
• Block construction: Heavy-duty cast iron lift blocks that are tapered to minimize driveline vibrations and maintain driveline harmony between leaf springs and axle.
• U-bolts and hardware: Extended zinc-plated rear u-bolts designed specifically for GMC Suburban applications, plus the corresponding nuts and fasteners for a secure, durable install.
• Installation method: Simple bolt-on installation by inserting the lift blocks between the factory rear leaf springs and axle.
• Block dimensions: 5.5" (H) x 2 1/2" (W) x 5 1/4" (L) to fit the rear suspension geometry accurately.
• U-bolt dimensions: 9/16" x 2 3/4" x 14 5/8" (square) for solid clamping of the axle with the new blocks.
• Shocks compatibility: In many applications, factory-length shocks must be replaced with extended-length shocks when installing rear blocks 2" or taller; check your shock absorbers for proper fitment.
• Vehicle fitment: Designed for rear axles on 4WD GM trucks and SUVs from 1988–1998, including Suburban, K1500, K2500, K3500, Tahoe, and Yukon models.
• Block variety: Kits may include either cast blocks or aluminum blocks depending on production lot; both are engineered to maintain strength and reliability.
• Corrosion resistance: Zinc-plated hardware provides improved protection against rust and wear in demanding environments.

This kit is purpose-built for rear-axle applications and delivers a straightforward, bolt-on solution that preserves a comfortable ride while delivering the visual and practical benefits of additional rear height. It’s ideal for GMC Suburban owners and GM truck enthusiasts seeking a robust, long-lasting lift with purpose-made components that align with the vehicle’s original suspension geometry.