Timbren FRTT350J Ses Suspension Enhancement System for 2017-2021 F250/350 Pickup

This SES Suspension Upgrade fits the rear suspension of a Ford F-250 & F-350 pickup truck.

Each laser cut piece of steel is precision bent and powder-coated to ensure a quality fit.

We’ve engineered our hollow rubber springs to deliver a progressive spring rate.

In other words, the more weight that pushes down on the rubber springs the harder they work to prevent rear end sag.

Whether you’re pulling a trailer or carrying a heavy load in the bed of your truck, our hollow rubber springs adjust automatically to keep the vehicle level at all times.

This SES Suspension Upgrade replaces the jounce stop on the frame.

Its unique design ensures superb ride quality – loaded or unloaded.

(There should be a ½” to 1 ½” gap between rubber spring and axle to ensure unloaded ride quality.

) Unlike other auxiliary spring systems, the SES Suspension Upgrade guarantees the best of both worlds.

We recommend Severe Service kits be used with a slide-in camper or salt spreader.

In fact, any application that requires maximum stability (reducing roll and sway) calls for a Severe Service upgrade.

(Click here for more info on Severe Service recommendations)

FRTT350J* replaces the bumpstops on the rear suspension of the 2015-2020 Ford F-450 Super Duty pickup truck models.

*For a complete listing please refer to the FITMENT tab below.

This kit is rated at 8000 lbs capacity.

Even though you’re increasing the spring rate by adding this upgrade, this does not increase the GVWR (Gross Vehicle Weight Rating).

Please make sure that the load does not exceed the GVWR set by the manufacturer.