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The 2023+ Super Duty introduced some new challenges, specifically pertaining to caster. The steering assist and Ford’s 1° – 3.6° allowable caster range seems to work alright for those equipped with stock, relatively low-mileage Super Duties but, once a lift or oversized tire enters the equation, the handling at this low caster specification leaves us wanting.
When lifting the front of the Super Duty 3 – 3.5″, the factory caster is reduced by approximately 1.5°. For the 2020-23 Super Duty, we provide a 2° caster shim which is enough to restore this caster and add a touch more – unfortunately, this “touch more” is rarely enough for proper tracking. This leaves us recommending our Adjustable Radius Arms proven to add an additional 2.5° of caster (when maxed). Combining the Carli Arms and 2° shims results in a Super Duty on 37″ tires that holds a lane, and returns to center after a turn, better than a stock truck.
With the testing of available caster correction options, we were able to get the truck where Ford wants it, but is that where we want it? The factory Ford caster specification is outlined in the above printouts; it reads:
These specs are for a stock Super Duty and, with smaller tires, the lower end of the range tracks and drives OK. Honestly, we’ve put a ton of time behind the wheel of 23+ Super Duties with this caster spec and they all drive fine without any signs of death wobble or instability. We’ve always preferred the tracking and handling of larger tires in the 3°-5° range. We’ve run up to nearly 7° with no ill effect (no wobble, tracking or driveshaft binding issues) aside from a “heavy” steering wheel – even this would only likely apply to an XL/XLT without the electric steering assist of the higher trims.
Carli set out to design a Radius Arm Drop Bracket solution that would be more cost-effective than (and stack-able with) the Adjustable Radius Arms and, hopefully, provide ample caster correction, even with stock arms.
The stock radius arm frame pivot is tricky as it’s a stamp-formed bracket with a deep lip around the perimeter. Normally, we design our drop brackets to bolt to the inside of the factory pivot, form along the bottom of the factory bracket, then shape to fit the factory arm exactly as our 5.5″ drops do. The issue… this is too much drop and would cause excessive caster for the lift height and an upward radius arm angle at ride height.
