Ford 2003 Mustang Workshop Manual page 2749

25. Install the output shaft speed wheel and the snap ring.
26. CAUTION: Do not under any circumstance apply silicone sealant to the top of the
transmission case. The sealant could fall into the transmission and affect transmission
operation.
Apply a 3.2-mm (1/8-in) bead of silicone rubber to the sealing surface on the case cover.
27. NOTE: Verify that all of the synchronizers are in the NEUTRAL position and the gear shifter
forks in the cover are in the NEUTRAL position.
Install the case cover.
Position the cover toward the filler plug side of the transmission and lower it until the gear
shifter forks engage the synchronizers. Continue to lower the cover and move it into
position to engage the reverse gearshift lever.
28. Install the bolts.