Fixing Lincoln Transmission Fluid Leak

Some 2009-2014 Lincoln MKT/MKZ vehicles built on or before Oct. 14, 2013, and equipped with a 6F35 automatic transmission may exhibit a fluid leak from the left-hand transmission half shaft seal due to wear on the transmission case bushing.

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Sept. 20, 2023

Example of good half shaft journal (left) and a journal that shows metal transfer from the bushing (right).

Remove and inspect the left-hand half shaft journal surface finish. If the journal does not have any metal transfer from the bushing, the half shaft can be reused. Use the service kit that contains only the bushing and seal P/N 9L8Z-1177-E. If the shaft journal surface finishe has metal transfer from the bushing, replace the half shaft.

The replacement bushing with the red Teflon coating on the inside diameter of the bushing allows the reuse of the original half shaft if the shaft journal does not have any metal transfer from the original bushing. In either case, replace the half shaft bushing.

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Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.