AW55-50SN Valve Body, new and ready to install. Fits the AW55-50SN. Ships fast from the USA.
Every Volvo, Saab, Nissan, Opel/Saturn or Suzuki model that uses the AW55-50SN five-speed shares the same basic valve body design, even though Aisin Warner revised the casting several times across its 2001-2010 production run. This is a new, general-application AW55-50SN valve body for buyers who haven't pinned down their exact casting year yet, or whose unit matches this baseline revision rather than one of the model-year-specific castings we also stock.
The valve body is the hydraulic brain of the AW55-50SN. Line pressure from the pump passes through a stack of precision bores and spool valves to apply each clutch pack and band, and the pressure-control and shift solenoids that the transmission computer fires to time every gear change are mounted directly on the valve body casting. Transmission Digest's technical write-up on this family describes how wear inside those bores develops gradually rather than all at once, which is why a tired valve body usually shows up as a shift-quality complaint that gets worse over months rather than a sudden failure.
Scan for codes before replacing anything - a pressure-control or shift-solenoid code can mean the solenoid itself failed rather than the bore underneath it, and a sudden loss of 3rd gear right after a routine fluid service on these units has also been traced to a technician disturbing the low/reverse band anchor rather than any real valve body failure. Our AW55-50SN service guide separates those cases so you aren't replacing a valve body for a problem that's actually a solenoid or a band that walked out of position.
"AW55-50SN" covers more than one casting revision across its 2001-2010 production run, and this general listing is the baseline version rather than one matched to a specific model-year bracket. Pull your current valve body and check its casting marks and connector count against the listing photos before ordering, or send your year and VIN so we can confirm which version you actually need. If you already know your bracket, we carry it matched more tightly: 2000-2008, 2003-2007 and 2004-2007 versions, or the valve body with solenoids if yours needs those replaced too.
Change the fluid and filter in the same job, using JWS 3309 or an equivalent full-synthetic ATF, and avoid disturbing the low/reverse band anchor while the pan is off - it sits close enough to the fill plug on these units that the two get mixed up during a routine service. Torque the valve body bolts to the factory sequence and spec, then run the adaptive relearn once the car has a few drive cycles on it. If a single solenoid or circuit tested bad rather than the whole unit, a solenoid kit is the narrower fix; if you're rebuilding more of the unit at the same time, pair this with an overhaul kit.
| Fits | AW55-50SN |
| Part type | Valve Body |
| 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.
Pull your current valve body and check its casting marks and connector count against the listing photos, or send us your year and VIN. We also stock 2000-2008, 2003-2007 and 2004-2007 versions if you know your bracket.
Maybe not. On this transaxle family, the fill plug and the low/reverse band anchor sit close together, and removing the wrong one during a routine service can let the band walk out of position and cause the same symptom without the valve body failing at all.
No, this is the valve body casting and internal valves only. If a single solenoid tested bad, a solenoid kit is the narrower fix instead of replacing the whole unit.
JWS 3309 or a full-synthetic ATF built to that specification.
Yes - run the adaptive shift relearn after a few drive cycles so the computer stops compensating for the old, worn valve body.
