Leaf Spring Shackle Bushing for 1970 GMC C35/C3500 Pickup Base

GMC C35/C3500 Pickup Leaf spring shackle bushings are the platform-specific and dimensionally specified polyurethane bushing kits used to replace worn rubber bushings at the shackle pivot positions of the front and rear leaf spring assembly. The rear shackle is the pivoting link at the rear spring eye that allows the leaf spring to change its effective length as it deflects under load, and the frame shackle bushings at the chassis attachment points are the pivot positions through which the shackle articulates as the spring cycles. Together the spring eye bushings, shackle bushings and frame shackle bushings define the full articulation path of the rear spring assembly and the precision with which the axle is located longitudinally at every point in its travel.

As shackle and frame shackle bushings wear, play develops at each pivot interface, allowing the shackle to knock and clunk over road inputs, reducing spring articulation control and contributing to the rear end looseness that progressive shackle bushing wear introduces. Combined spring eye and shackle bushing kits address every pivot position in the spring assembly simultaneously, ensuring the full articulation path is renewed in a single service. The range covers front and rear leaf spring and shackle bushing kits in platform-specific and dimensionally specified profiles, front and rear combined kits, frame shackle bushing kits, standalone spring shackle bushings in dimensional OD specifications, greaseable shackle bushing and hardware kits, shackle pin kits, shackle sets and a bulk universal kit. Warranties range from limited lifetime to 3 years. Installation guides are available across most products.

Why Upgrade GMC C35/C3500 Pickup Suspension?

Shackle bushing wear is one of the most commonly encountered forms of leaf spring suspension deterioration on high-mileage trucks and 4WDs. The shackle is the highest-articulation component in the leaf spring assembly, pivoting through a greater angular range than the front eye with every suspension compression and rebound event. On vehicles used for towing, hauling or off-road driving, the shackle operates under elevated and more frequent loads that accelerate bushing wear beyond what age and normal use alone would produce.

Worn shackle bushings introduce play at the pivot interfaces that manifests as the characteristic clunk or knock from the rear of the vehicle over small road inputs, and as increased rear end compliance under lateral and longitudinal load. Renewing GMC C35/C3500 Pickup shackle and spring eye bushing positions together restores correct pivot compliance throughout the full spring assembly articulation path, eliminating shackle noise and rear end looseness and returning consistent, stable and controlled rear suspension behavior under all load and driving conditions.

GMC C35/C3500 Pickup Leaf Spring Shackle Bushing Range

The GMC C35/C3500 Pickup leaf spring shackle bushing range includes:

• GMC C35/C3500 Pickup Front Leaf Spring and Shackle Bushing Kits, Platform-Specific: Combined front spring eye and shackle bushing kits for applicable RWD and 4WD platforms, available in platform-matched profiles and for use with stock or aftermarket springs.
• GMC C35/C3500 Pickup Front Leaf Spring and Shackle Bushing Kits, Dimensional OD: Front spring eye and shackle bushing kits dimensionally specified by main eye OD for applicable platforms where a dimensional OD match is required.
• GMC C35/C3500 Pickup Front and Rear Combined Leaf Spring and Shackle Bushing Kits: Combined kits supplying front and rear spring eye and shackle bushings for the full spring assembly in a single purchase on applicable platforms.
• GMC C35/C3500 Pickup Front Frame Shackle Bushing Kits: Bushing kits for the front shackle-to-chassis frame attachment positions on applicable platforms, renewing the chassis side pivot of the front shackle assembly.
• GMC C35/C3500 Pickup Front Shackle Bushing Kits, 4WD: Front shackle bushing kits for applicable 4WD platforms, including leaf spring shackle bushings for front leaf spring equipped 4WD axle applications.
• GMC C35/C3500 Pickup Front Greaseable Shackle Bushing and Hardware Kits: Front shackle bushing kits with greaseable hardware, converting the front shackle assembly to a maintainable greaseable design on applicable platforms.
• GMC C35/C3500 Pickup Rear Leaf Spring and Shackle Bushing Kits, RWD: Platform-specific rear spring eye and shackle bushing kits for applicable RWD platforms in various cab pickup configurations.
• GMC C35/C3500 Pickup Rear Leaf Spring and Shackle Bushing Kits, 4WD: Platform-specific rear spring eye and shackle bushing kits for applicable 4WD platforms, available in configurations for common frame shackles and molded frame shackles.
• GMC C35/C3500 Pickup Rear Leaf Spring and Shackle Bushing Kits, Dimensional: Rear spring eye and shackle bushing kits dimensionally specified by main eye ID and frame shackle ID combinations for platforms where dimensional matching is required.
• GMC C35/C3500 Pickup Rear Leaf Spring and Shackle Bushing Kits, Mono Leaf: Rear spring eye and shackle bushing kits for applicable platforms fitted with a mono leaf rear spring configuration.
• GMC C35/C3500 Pickup Rear Frame Shackle Bushing Kits: Bushing kits for the rear shackle-to-chassis frame attachment positions on applicable RWD and 4WD platforms, renewing the chassis side pivot of the rear shackle assembly independently of the spring eye bushing.
• GMC C35/C3500 Pickup Rear Spring Frame Shackle Bushing Kits: Combined rear frame shackle bushing kits covering the frame attachment positions of the rear shackle on applicable RWD and 4WD platforms.
• GMC C35/C3500 Pickup Spring Shackle Bushing Kits, Dimensional OD: Standalone shackle bushing kits in dimensionally specified OD for non-platform-specific shackle bushing renewal where a dimensional match is required.
• GMC C35/C3500 Pickup Spring Eye Rear and Shackle Bushing Kits: Combined rear spring eye and shackle bushing kits for applicable platforms requiring renewal at both rear eye and shackle positions in a single purchase.
• GMC C35/C3500 Pickup Rear Greaseable Shackle Bushing and Hardware Kits: Rear shackle bushing kits with greaseable hardware, converting the rear shackle assembly to a maintainable greaseable design on applicable platforms.
• GMC C35/C3500 Pickup Rear Leaf Spring Shackle Bushing Sets: Rear shackle bushing sets for applicable platforms where standalone shackle bushing renewal is required without spring eye renewal.
• GMC C35/C3500 Pickup Shackle Sets, Multi Leaf: Complete shackle hardware sets for multi leaf rear spring applications on applicable platforms.
• GMC C35/C3500 Pickup Shackle Pin Kits, Mono Leaf: Shackle pin hardware kits for mono leaf rear spring applications on applicable platforms.
• GMC C35/C3500 Pickup Bulk Universal Leaf Spring and Shackle Bushing Kits: Universal spring eye and shackle bushing kits for non-platform-specific applications across a range of spring and shackle dimensional specifications.
• GMC C35/C3500 Pickup Complete Vehicle Spring and Shackle Bushing Kits: Combined vehicle-specific kits covering all rear leaf spring and shackle bushing positions for applicable RWD 4-cylinder models in a single purchase.

Why Purchase GMC C35/C3500 Pickup Leaf Spring Shackle Bushings?

Combined spring eye and shackle bushing kits that address every pivot position in the spring assembly simultaneously deliver the most complete and consistent renewal of the rear spring articulation path in a single service, eliminating the compliance mismatch that results from renewing only selected positions while others remain worn. For high-mileage trucks that have developed shackle knock and rear end looseness, a complete kit is the most efficient path to restoring correct rear suspension behavior in a single installation.

GMC C35/C3500 Pickup Greaseable shackle hardware kits deliver a long-term serviceability benefit by converting the shackle pivot to a maintainable design, allowing the shackle pin to be periodically re-lubricated to prevent seizing and extend the service life of the bushing installation. Dimensional specifications across the range allow the correct bushing profile to be matched by main eye ID, shackle OD or frame shackle ID on platforms where a platform-specific kit is not required.

Installation and Support

GMC C35/C3500 Pickup Leaf spring shackle bushing kits are designed for installation at the front and rear spring eye, shackle and frame shackle pivot positions on applicable platforms. Installation times range from under an hour for simple shackle bushing sets to three hours for complete spring eye and shackle kit installations. The correct kit requires matching the spring configuration, main eye ID or OD, shackle bolt ID and frame shackle design of the specific vehicle. Installation guides are available across most products. For additional technical assistance, a dedicated support team is available to confirm correct product selection and fitment for the specific platform and shackle assembly configuration.

Repair and Upgrade

GMC C35/C3500 Pickup Leaf spring shackle bushings are manufactured from high-strength polyurethane engineered to withstand the angular articulation, sustained load cycling and environmental exposure that shackle and frame shackle pivot positions are subject to in everyday, towing, hauling and off-road use. Polyurethane maintains correct shackle pivot compliance for longer than factory rubber alternatives under the elevated articulation and load inputs that working trucks and 4WDs generate, delivering more consistent rear spring articulation and rear axle location throughout the service life of the installation. Greaseable hardware kits extend service life further by allowing periodic pin lubrication. Warranties range from limited lifetime to 3 years depending on the product.

Who GMC C35/C3500 Pickup Leaf Spring Shackle Bushings Are For

GMC C35/C3500 Pickup Leaf spring shackle bushings are a practical solution for:

• Professional shops completing rear spring servicing and suspension overhauls on applicable RWD and 4WD trucks in standard, extended and crew cab configurations requiring complete spring eye and shackle bushing renewal at all pivot positions to eliminate shackle knock and restore correct rear spring articulation compliance.
• Truck and 4WD owners renewing worn shackle and spring eye bushings to eliminate rear end clunking, restore correct shackle pivot compliance and return stable, consistent rear suspension handling under towing, hauling and off-road conditions.
• Anyone requiring greaseable shackle bushing and hardware kits to convert front or rear shackle assemblies to a maintainable greaseable design on heavily used platforms where long-term shackle serviceability is a priority.
• Shops and DIY users requiring dimensionally specified spring eye and shackle bushing kits matched by main eye ID, shackle OD or frame shackle ID for non-platform-specific or aftermarket shackle applications.

The right leaf spring shackle bushing kit renews every shackle and spring eye pivot position in the assembly, eliminates shackle knock and rear end looseness, and delivers consistent, stable and controlled rear spring articulation under every load and driving condition.

Shop GMC C35/C3500 Pickup Leaf Spring Shackle Bushings

Explore the full GMC C35/C3500 Pickup leaf spring shackle bushing range and find the right kit for your vehicle. With front and rear platform-specific spring eye and shackle bushing kits for applicable RWD and 4WD trucks in various cab configurations, front and rear combined kits, dimensional OD and ID specified kits, frame shackle bushing kits, greaseable shackle hardware kits, mono and multi leaf shackle and pin hardware sets, standalone spring shackle bushing kits in dimensional OD sizes and a bulk universal kit, you can renew every shackle and spring eye pivot position accurately and complete every leaf spring shackle service with confidence.