AW55-50SN Master Rebuild Kit 2000, new and ready to install. Fits the AW55-50SN. Ships fast from the USA.
The Aisin AW55-50SN five-speed is behind a long list of front-drive and all-wheel-drive cars, and when one in a Saab 9-3 or 9-5, a Saturn Vue or Ion, a Chevrolet Equinox or an Opel Vectra starts slipping, flaring between gears or losing a gear entirely after years of hard use, valve body and solenoid work alone will not bring it back. This super master rebuild kit for 2000-up AW55-50SN and AW55-51SN transmissions covers the full overhaul: the gasket and seal overhaul kit, the friction clutch packs, the band and a new filter, packaged so the whole unit can be resealed and every friction surface renewed in one teardown.
The AW55-50SN builds its five ratios from a set of hydraulic clutches and brakes plus a single band. Every apply element depends on a piston sealing pressure from the valve body, and every friction surface wears with heat and mileage. The band is especially important: ATRA's Gears magazine shows that when the band is released from its anchor the unit loses 3rd gear, so a worn or out-of-position band is one of the clearest causes of a missing 3rd. A master kit replaces the rubber, the paper and the friction material together, which is the only way to know every circuit is sealed again when the unit goes back in.
Valve body and pressure control solenoid wear cause many AW55-50SN complaints, so rule them out first. Sonnax describes worn linear solenoid and valve bores on this unit and the harsh shifts and flares they cause, and a car with that problem may not need clutches at all. Check the fluid level and condition, scan for solenoid and ratio codes, and read our AW55-50SN service guide for the checks specific to this transmission. If you want to go deeper on pressure and slip, our Aisin slipping under load guide walks through it. If the fluid is burnt and the unit slips in more than one gear, the clutches are worn and this kit is the right repair.
This kit is listed for 2000-up AW55-50SN and AW55-51SN transmissions in GM, Opel, Saab and Saturn vehicles. Volvo, Nissan (RE5F22A) and Suzuki also used versions of this unit, and Gears magazine points out that the different manufacturers' versions are not interchangeable because they have operational differences, so compare the clutch plate count and the band to your old parts before assembly. If you are unsure, send us the year, make, model and VIN and we will confirm fitment. All of our parts for this family are on the Aisin transmission parts page.
Soak the frictions in clean fluid before assembly and check every clutch clearance as each pack goes in. Inspect the pump, the bushings and the one-way clutches; the AW55-50SN sprag clutch is worth replacing on a high-mileage unit. Install the band carefully and make sure the anchor is correctly seated, since the anchor and fill plug look alike on the case and loosening the wrong one releases the band. Because the valve body is the other major wear area on this transmission, many builders also replace the linear solenoids with the AW55-50SN eight-piece solenoid set while the unit is out. Refill with JWS 3309 type fluid, check the level through the fill plug at the correct temperature, and reset the adaptive values with a scan tool, then drive through a full relearn as covered in our relearn after a rebuild guide.
| Fits | AW55-50SN 2000 |
| 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.
It is listed for 2000-up AW55-50SN and AW55-51SN transmissions in GM, Opel, Saab and Saturn vehicles. Volvo, Nissan and Suzuki versions of this unit have operational differences, so compare your old parts or send us your year, make, model and VIN first.
Yes. This super master kit includes the overhaul gasket and seal kit, friction clutch packs, the band and a filter.
It can be. On the AW55-50SN the band anchor looks like the fill plug, and loosening it by mistake releases the band and causes no 3rd. A worn band or a valve body fault can also cause it, so check the service history and the anchor before tearing the unit down.
Use a JWS 3309 type fluid, also sold under Toyota T-IV and maker-specific part numbers for Volvo and Saab. Fill and check the level through the fill plug at the specified temperature.
On a high-mileage unit it is a good idea. Solenoid and valve body wear are the other common failure on this transmission, and the valve body is already out during a rebuild.
