722.5 Master Rebuild Kit, new and ready to install. Fits the 722.5. Ships fast from the USA.
The 722.5 is one of the rarest automatics Mercedes-Benz ever built: the five-speed W5A 030 offered from 1990 until the 722.6 replaced the whole family in 1996. If you own one and it is slipping, flaring on the 2-3 shift, engaging slowly or leaking from several places at once, parts are hard to find, and this new master rebuild kit is listed specifically for the 722.5, with an S320 application reference. It is meant for the owner or shop that has decided the unit comes apart and every friction, steel, seal and gasket gets replaced together.
Mercedes built the 722.5 by taking the four-speed 722.3/722.4 and bolting a separate overdrive housing to the back of it. Gears one through four and reverse are controlled hydraulically, as on the four-speeds, while fifth gear has its own electronic control. That makes the 722.5 the most complex unit of its generation: four planetary gearsets, four brakes and three clutches, against three gearsets, three brakes and two clutches in the 722.3 and 722.4. More packs means more frictions, more steels and more piston seals, which is why a 722.5 master kit is not interchangeable with a four-speed kit and why piecing the job together from loose parts gets expensive. A master kit renews the friction surfaces and the sealing in both the main case and the overdrive section in one job.
The 722.3, 722.4 and 722.5 share a well-known set of hydraulic shift complaints: a harsh 1-2 upshift and soft or flaring 2-3 and 3-4 shifts. Superior sells a dedicated shift correction kit for 1980-1995 gasoline units of all three types to fix exactly that pattern, which tells you these symptoms are often valve body calibration rather than worn clutches. If the fluid is still red and clean, look at the valve body first; our 722.5 valve body is built to this unit's specification. Burnt fluid, metal or friction material on the magnet, or slip in every gear means the clutch packs are worn and this kit is the right purchase. If fifth gear alone misbehaves, check the overdrive section's electrical control before condemning the whole unit.
This kit is listed for the 722.5 with an S320 reference. Mercedes offered the W5A 030 as an extra-cost option and ran the 722.3, 722.4 and 722.5 in parallel across the same model lines, so model year alone will not tell you what you have. Read the transmission code on the case before ordering and confirm it reads 722.5 or W5A 030. If it reads 722.3 or 722.4, the 722.3 master rebuild kit or the 722.4 master rebuild kit is the correct box. If your car is a 1996 or later model with the fully electronic 722.6, see the 722.6 common problems guide instead. Because this is a low-volume unit and the listing does not itemize every piece, compare the kit contents against your old parts as you disassemble, and send us the year, model and VIN if you want us to check the match first. The full family of parts we carry is on the 722 transmission parts page.
Plan for two housings: the main four-speed case and the overdrive section each have their own clutch and brake packs and their own sealing, so keep the parts for each section separate as they come out. Inspect drums, bushings and the pump for wear before reassembly, soak the new frictions in fluid, and set every pack clearance to the factory figure. Use the fluid and fill quantity Mercedes specifies for your transmission code, flush the cooler and lines before refilling, and if the valve body was the source of harsh or soft shifts, service it while the unit is out.
| Fits | 722.5 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Reference | S320 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The 722.5 (W5A 030) is the 1990-1996 five-speed built from the hydraulic 722.3/722.4 with a separate electronic overdrive section added. The 722.6 that replaced it in 1996 is a different, fully electronic design, and the rebuild parts do not interchange.
Read the code stamped on the transmission case. It should read 722.5 or W5A 030. Mercedes offered it as an option alongside the 722.3 and 722.4 on the same models, so the year and model alone are not enough.
The 722.5 has four gearsets, four brakes and three clutches compared with three gearsets, three brakes and two clutches in the four-speeds, so there are more frictions, steels and seals to replace, and it was built in small numbers.
Not always. That symptom pattern is common to the whole 722.3/722.4/722.5 family and is often corrected in the valve body. If the fluid is clean, check the valve body first. Burnt fluid and slip in every gear point to a rebuild.
Use the fluid and fill quantity that the Mercedes-Benz service information specifies for your transmission code, and flush the cooler and lines before the rebuilt unit is filled.
