5R55S Master Rebuild Kit 2002-2007, new and ready to install. Fits the 5R55S. Ships fast from the USA.
A 5R55S that has lost second or fifth, flares between gears, or takes a few seconds to engage reverse is a common sight in a 2005-2007 Mustang V6, a 2003-2006 Lincoln LS or a 2003-2005 Thunderbird with high mileage. When the pan shows band lining and burnt fluid, the fix is a complete overhaul. This 5R55S master rebuild kit covers 2002-2007 units and includes the parts that wear in this transmission: the overhaul gasket and seal set with a forward clutch bonded piston, a Raybestos friction clutch module (RCP96-139) and steel module (000429), Borg Warner high-energy intermediate and overdrive bands (10736BW, two pieces) and a low/reverse band (10711BW), a new 9L2Z-7G391-A solenoid block, a Transgo SK5R55W shift kit, a filter and a pump bushing.
The S stands for synchronous shift. Ford tuned it so the apply and release of each element overlap closely, which makes it shift crisply when it is healthy and makes it sensitive to any loss of apply pressure. Second and fifth ride on the overdrive band, third on the intermediate band and reverse on the low/reverse band, so the bands do much of the work in the gears where the S usually fails. This kit replaces all three bands, every clutch friction and steel, and every seal. It also replaces the solenoid block, which carries the on/off shift solenoids, the PWM converter clutch solenoid and the three pressure control solenoids that set line pressure and band and clutch apply feel. The Transgo calibration firms up the band applies.
Drop the pan and inspect the fluid and magnet. If the fluid is clean, look at the solenoid block, harness and valve body first. A 5R55S valve body for 2002-2008 may solve it without a teardown. If the bands are burnt, find out why before you rebuild. Our servo pin bore wear guide explains how worn case bores bleed off apply oil for the overdrive and intermediate bands, and the 5R55S rebuild cost breakdown covers the case repair decision and the other items that add to the bill.
The listing is for 5R55S transmissions from 2002-2007. Sonnax notes that the S replaced the 5R55N in the Lincoln LS and Thunderbird for 2003, and the S later went into the Mustang V6 and the Explorer and Mountaineer. Early LS and Thunderbird owners need to confirm they have an S and not an N. The N has two cast bosses behind the intermediate servo cover, a reverse pressure switch and an intermediate clutch, and few of its parts interchange. The soft parts and bands here are shared with the 5R55W. The 38-tooth overdrive sun gear that sets the S ratios is a hard part and is not in the kit. For the solenoid block, ATRA lists the early 1L2Z-7G391-AG pack for 2002-2003 units and the late pack, superseded to the 9L2Z included here, for 2004 and later. On a 2003 LS or Thunderbird, match the number on your old block or send us the year and VIN. The full lineup is on the 5R55 parts page.
| Fits | 5R55S 2002-2007 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
If the unit is a 5R55S, the clutches, bands, seals and shift kit fit. Check the solenoid block number: ATRA lists 2002-2003 units with the early 1L2Z-7G391-AG pack, and this kit includes the late 9L2Z block. Send us your VIN if you are unsure.
Per Sonnax, the N has two cast bosses just behind the intermediate servo cover, while the W and S have one. The N also has a 4R70W-style base plate and a reverse pressure switch under the pan. The N was replaced by the S in the LS and Thunderbird for 2003.
No. This kit covers frictions, steels, bands, seals, the solenoid block, the shift kit, the filter and a pump bushing. The 38-tooth overdrive sun gear and planetary carriers are hard parts and are sold separately.
Mercon V. Expect roughly 11.2 quarts dry behind the 3.0L or 3.9L engines and 12.4 to 12.7 quarts behind the 4.0L or 4.6L, and set the final level hot.
On this family it is often servo pin bore wear in the case. Apply oil leaks past the worn bore, so the band gets less pressure than the computer commands. Repair the bores during the rebuild or the new bands can fail the same way.
