ReadyLift Xtreme-Duty Fabricated A-Arm Kit
Fits 2011-2019 6.6L Duramax V8 (LML) · 6.6L Duramax V8 (L5P)
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Price tracked 11 times since Jul 25, 2026 at the stores we check daily, not eBay: low $649.95, high $649.95, currently $649.95.
Requires: Fits 2WD and 4WD. ReadyLift states Single Cab configuration has not been validated for fitment and drivability.
where to buy · 3 retailers tracked
Laser-cut, CNC-bent 4130 chromoly replacement upper control arms with self-lubricating bushings and 1-ton spring-loaded ball joints, taking the place of the stock stamped-steel arms.
why this one — The right fix if you have already levelled a 2011-2019 Sierra HD and the factory upper arms are binding or eating ball joints, and one part number covers both the GMT900 and K2 bodies plus 2WD and 4WD. Honest downsides: ReadyLift has not validated Single Cab fitment or drivability, it is a 6-hour job, and it needs an alignment afterward that is not in the price.
Suspension and control-arm upgrade, not a power-related part.
Questions about this category
No published gain figure for this part, and nothing here is a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See how we check a price and our affiliate disclosure.