Torklift StableLoad Suspension: Upper vs Lower Kits & Parts

Truck camper weight can make a pickup settle at the rear before its factory overload springs begin supporting the load. Torklift StableLoad kits engage those existing overload springs earlier to help control squat, sway and body movement. The first step is identifying whether your truck uses an upper overload, a lower overload, or both—because the kits install in different places and are not interchangeable.

Upper vs lower overload: what changes?

Lower overload: A shorter, heavier leaf sits beneath the main rear leaf-spring pack, usually with a gap between them when unloaded. StableLoad Quick Disconnect places hinged wedges at the ends of that spring to bring the overload into action sooner; the wedges can be disengaged when the extra support is not needed.

Upper overload: An additional factory leaf sits above the main pack and approaches frame-mounted contact pads as the truck settles. Upper StableLoad units change that contact point so the factory upper overload contributes support sooner. They are not the same parts as the lower quick-disconnect wedges.

Compare Torklift part numbers

Drilling matters: A7310 is intended for a factory-drilled lower overload. A7311/A7311S is the drilling-required version; Torklift specifies four 7/16-inch holes made using the supplied instructions and drill bits. F7859S belongs to a separate vehicle-specific no-drill series. Do not choose by appearance alone or assume that all trucks of a particular make have the same holes.

See the individual kits

A7310 — Lower overload, factory holes

Quick-disconnect wedge kit for an approved lower-overload spring with the required factory holes.

View A7310 product

A7311S — Lower overload, drill kit

Stainless quick-disconnect design supplied for approved lower overloads that require new mounting holes.

View A7311S product

A7200 — Upper overload contact pads

Four-piece upper-overload kit designed to engage an appropriate factory upper overload spring sooner.

View A7200 product

A7202 — Upper overload, GM application

A separate upper-overload pad kit for specified Chevrolet and GMC suspension applications.

View A7202 product

Before you order

1. Identify the factory rear overload spring's location and check whether a lower spring has pre-drilled end holes.
2. Check the precise kit number against Torklift's application information for your truck year, model and suspension configuration. Existing overload springs are required.
3. Inspect the unloaded gap, contact pads and any suspension modifications. Low clearance can affect engagement and ride quality; use the manufacturer's instructions for allowable adjustment.
4. Install all supplied components in their specified locations. Never drill a leaf spring without the instructions for the exact drilling-required kit.

StableLoad improves how the existing suspension supports an approved load; it does not increase the truck's factory payload, axle or gross vehicle weight ratings. If you carry a slide-in camper, verify the camper's loaded weight against the truck's ratings as well as the suspension kit fitment.

Looking for a vehicle-specific quick-disconnect kit? View Torklift F7859S StableLoad Lower. For the manufacturer's installation sequence, use the illustrated Torklift references linked above.