5R55W Transmission Front Pump Assembly

A complete bolt-in front pump assembly for the Ford 5R55 family: 5R55W, 5R55S and 5R55N, 2001 and later. These units are in the Explorer, Explorer Sport Trac and Mercury Mountaineer (5R55W and 5R55S), the 2005-2010 Mustang (5R55S), and the Lincoln LS and Thunderbird (5R55N). The pump comes as an assembly, so you are not reusing a scored body or worn gears.

When to replace the pump: the stator support bushing wears and lets the torque converter hub walk, which leaks fluid out the front seal and chews up the new seal; the pump gears or pocket score after a converter or clutch failure sends debris through the unit; or the stator sealing rings wear and you get low line pressure, slipping and slow engagements. If you are doing a rebuild after a burned coast clutch or intermediate band, a new pump is cheap insurance against metal left in the old gears.

Install notes: pull the transmission and converter, remove the old pump and inspect the converter hub for wear before you reuse it. Lube the new pump bore, install a new front seal and pump O-ring if they are not already in place, and torque the pump bolts evenly in a cross pattern. Set up input shaft end play with the correct selective washer before the bell housing goes on. Then flush the cooler lines before startup so debris from the old failure does not go straight back into the new pump.