Volvo AW55-51SN 5-Speed Automatic Transmission (AWD) · Volvo · Expert rebuild service since 1987. Lifetime warranty. Free diagnostic.
2001–2010 Volvo XC70 (AWD), 2001–2010 Volvo V70 XC (AWD), 2003–2010 Volvo S60 AWD, 2003–2010 Volvo XC90 (5-cylinder FWD variant)
| Configuration | 5-speed automatic AWD transaxle (Aisin AW, AWD output) |
|---|---|
| Gear Ratios | 1st 3.59:1 · 2nd 2.19:1 · 3rd 1.41:1 · 4th 1.00:1 · 5th 0.83:1 · Rev 3.16:1 |
| Fluid Type | Volvo ATF (JWS 3309 spec); Haldex AWD fluid separate |
| Fluid Capacity | 7.8 qts total, 3.6 qts service refill; 0.5 qt Haldex AWD separately |
AWD duty cycle combined with Volvo XC70 road use accelerates solenoid body wear beyond FWD AW55-50 rates.
Symptoms: DTC P0750–P0758, limp mode, harsh shifts
The Haldex AWD pump fails independently from the main transmission, causing loss of AWD capability. Confused with transmission failure by owners.
Symptoms: AWD warning light, loss of rear traction on slippery surfaces, pump noise from rear — this is NOT the main transmission
The output shaft seal between the AW55-51 and the Haldex AWD unit leaks ATF into the Haldex system.
Symptoms: ATF leak from transfer area, mixed fluid in Haldex pump, AWD engagement loss
AW55-51SN rebuild replaces solenoid body, all clutch packs, torque converter, transfer case seal, and all seals. JWS 3309 fluid used. Haldex pump is inspected and serviced separately.
JWS 3309 ATF every 40,000 miles. Haldex AWD fluid requires separate service every 30,000 miles — do not confuse Haldex failure with transmission failure. Both systems need independent diagnosis and service.
The AW55-51 is the AWD variant with a Haldex rear-axle output. The main transmission internals are identical; the difference is the output shaft configuration.
Volvo XC70 AWD, V70 XC AWD, S60 AWD, and some XC90 5-cylinder FWD variants from 2001–2010.
A full rebuild ranges $1,800–$2,300 at Chicago Transmission.
Not necessarily — the Haldex AWD pump is a separate system that fails independently. Diagnosis determines whether it's the Haldex pump or the main transmission.
Yes — every 30,000 miles with specific Haldex fluid. This is separate from the JWS 3309 ATF service for the main transmission.
Free diagnostic, written estimate, lifetime warranty. Chicago's AW55-51SN rebuild specialists since 1987.
