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I glanced around and didn't see it posted here so I figured I'd post it just in case. SPL released a TSB for their front control arms which includes ones for the S550.
Link: https://www.splparts.com/tsb-2301/
TO: Customers/drivers, builders/repair shops, and race teams
RE: Immediate and recurring inspection; torque setting & replacement of damaged cap bolts in aftermarket SPL front lower control arms: FLCA SKU’s: FLCA F8X, FLCAR F8X, FLCA E9X, FLCAR E9X, FLCA F3X, FLCAR F3X, FLCA G29, FLCA G8X, FLCA G8X IX, FLCA GT350, FLCA ATS, FLCA CAM6, FLCA S550
Effective Date: JULY 16TH, 2023 with cap bolt inspection, torque confirmation of 180/ft. Lbs or replacement before further use.
Description of Issue: SPL has received inquiries regarding bending and failures of cap bolts used in SPL front lower control arms. Information supplied to SPL indicates inadequate or un-retained torque of retaining nut/bolt to lower control arm may be contributing to bending and fatigue of grade-8 fasteners.
Recommended Action: Visually inspect cap bolt and control arm attachment points for bending, impact or other wear/distortion/damage; paying particular attention to the area where cap bolt threads exit retaining nut:
Link: https://www.splparts.com/tsb-2301/
TO: Customers/drivers, builders/repair shops, and race teams
RE: Immediate and recurring inspection; torque setting & replacement of damaged cap bolts in aftermarket SPL front lower control arms: FLCA SKU’s: FLCA F8X, FLCAR F8X, FLCA E9X, FLCAR E9X, FLCA F3X, FLCAR F3X, FLCA G29, FLCA G8X, FLCA G8X IX, FLCA GT350, FLCA ATS, FLCA CAM6, FLCA S550
Effective Date: JULY 16TH, 2023 with cap bolt inspection, torque confirmation of 180/ft. Lbs or replacement before further use.
Description of Issue: SPL has received inquiries regarding bending and failures of cap bolts used in SPL front lower control arms. Information supplied to SPL indicates inadequate or un-retained torque of retaining nut/bolt to lower control arm may be contributing to bending and fatigue of grade-8 fasteners.
Recommended Action: Visually inspect cap bolt and control arm attachment points for bending, impact or other wear/distortion/damage; paying particular attention to the area where cap bolt threads exit retaining nut: