Works on Square bend to clamp 2.5" wide leaf springs on 1988 - 1999 Chevrolet GMC C1500 C2500 C3500; Does not fit models with spring overloads; Does not fit models with spring overloads; INCLUDES: 4 OEM grade steel square leaf spring axle u-bolts with grade 8 hi-nuts and security spring washers. SPECIFICATIONS: 4x 12"x 2.5"x9/16" u bolts and 2x 5"L x 2.5"W x 3"H rear steel blocks. TECHNICAL NOTES: Retighten u-bolts after the first 500 miles; Minor settling from new or repaired springs can cause a reduction in clamp force leafs with 4" of thread can be cut down to fit many applications.

• VEHICLE COMPATIBILITY: 1988 - 1999 Chevrolet GMC C1500 C2500 C3500
• KIT INFORMATION: 2x US Steel lift blocks with 4x OEM grade steel square bend u-bolts, hi-nuts and security spring washers.
• PRACTICAL NOTES: Wheel alignment is recommended; Retighten u-bolts after the first 500 miles
• ADVANTAGES: Core Suspension solid steel lift blocks are stronger than aluminum. They are designed to increase rear load and towing capacity. Made for maximum u bolt clamp force with an even distribution of pressure, Core axle u bolts eliminate flexing and provide the strength to maintain original vehicle handling.
• NOTE: U bolt color may vary