Ford 2003 Mustang Workshop Manual page 2753

38. Apply a 3.2-mm (1/8-inch) bead of silicone rubber to the sealing surface on the gearshift lever.
39. Install the gearshift lever.
40. Using the special tool, install the extension housing fluid seal.
41. Install the case plug.
42. NOTE: Before installing the transmission, the ball stud, clutch release lever and the input shaft
must be cleaned and lubricated with grease.
Install the clutch release hub and bearing and the clutch release lever. For additional
information, refer to Section 308-01 .