Chevrolet Silverado 1500 RoadActive Suspension HD

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4blok is the Authorised Australian Distributor buying direct from the USA.

Notes-

"Important Fitment Notice: This kit (5611-TZHD) is exclusively engineered for the updated rear multi-leaf spring configuration found on 2025 and 2026 model year Silverado 1500 trucks."
"Check Your Hardware: If your Silverado is a 2019–2024 model, the leaf arch distance is shorter; you must order the 4611-HD kit instead. The 5611-TZHD connecting rods are longer and will not tension down correctly on older 2024 or earlier leaf packs."
"Aussie Delivered Specs: While US marketing states 'Does not fit single-leaf models', all official Australian-delivered GMSV 1500 variants (LTZ Premium and ZR2) feature traditional heavy-duty multi-leaf steel packs from the factory, making this kit a 100% bolt-on upgrade."
Kit includes an easy to install RAS Spring for each rear leaf spring.
RoadActive Suspension kits are designed to strengthen the rear leaf springs for a loaded vehicle or towing without negatively affecting unloaded ride quality.
This kit will reduce rear bounce and squat when loaded while significantly improving stability, handling and performance at all times.