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TSB Document:

Affected Component: EQUIPMENT ADAPTIVE/MOBILITY

Summary
Some 2018-2020 Expedition/Navigator two-wheel drive (2WD) vehicles may exhibit a clunk noise from the driveshaft area when shifting from REVERSE to DRIVE or DRIVE to REVERSE and/or during coast down. This condition may be caused by a slip/stick condition at the transmission output flange/anti-ting ring interface. To correct the condition, follow the Service Procedure to apply a light coating of grease to the anti-ting washer and output shaft splines.

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Date Published
AUG 12, 2020
NHTSA TSB #
10179116
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