TSB's

Noisy Pony

Some 2011-2014 Ford Mustangs may exhibit a grunt/squeak/creak/chirp noise from the front lower control arm hydro bushing. These noises may occur over large vertical bumps such as speed bumps, pot holes, rough roads and driveway approaches.

Attach chassis ears onto both lower control arm hydro bushing bracket tabs to verify that the noise is coming from the hydro bushing(s). The hydro bushing is the large diameter bushing at the rear of the control arm. Due to hydraulic fluid flow, some noise from the bushing is normal. There would typically be some difference from side to side on a unit with a noisy control arm.

If the noise is confirmed as coming from a hydro bushing, replace the affected lower control arm with the new design control arm with a shield and three screws. Tighten the three shield screws to 62 in.-lbs. (7 Nm).

P/N ………………….……. PART

CR3Z-3078-D....................arm assembly, right front

CR3Z-3079-D....................arm assembly, left front

W710141-S439.................lower arm rear bolt (2 required)

W709865-S439.................lower arm front bolt (1 required)

W710909-S439.................steering gear bolt (2 required)

W711123-S439..................ball joint bolt (1 required)

W520215-S440.................lower arm rear nut (2 required)

W520214-S440.................ball joint nut (1 required)

W713882-S437.................rack nut

4R3Z-5G221-LH................shield, left

4R3Z-5G221-RH...............shield, right

W704873-S439.................shield screws (3 required)

Note the location of the hydro bushing shield (at top of illustration).
<p>Note the location of the hydro bushing shield (at top of illustration).</p>

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