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Valve Body Identification

The transaxle is manufactured by Aisin Warner, but is used by many car makers. Volvo calls it an AW55-50, Nissan and Infiniti call it an RE5F22A, GM (Chevy, Saab, Saturn & Pontiac) calls it an AF33-5.

Part Number Chart

Vehicle Type
Early/Late
Has B5 Spring
VBX Part Number
GM/Saab/Saturn Early
No
AW55GE
GM/Saab/Saturn Late
No
AW55GL
GM/Saab/Saturn Late
Yes
AW55GMLSP
Volvo
Early
No
AW55VE
Volvo/Nissan Late
No
AW55VL
Volvo/Nissan Late
Yes
AW55NL

Identify Vehicle Type

If vehicle type is not known check the S2 solenoid. A domed top on the S2 is a GM. A flat top with four ribs radiating from the hole in the center of the S2 is a Nissan/Volvo. Nissan, Infiniti & Volvo use one shift solenoid configuration. Others use a different configuration.

GM/Saab/Saturn
Volvo/Nissan


Identify Early/Late

Look for a letter that is cast into the valve body to the right of the S4 solenoid hold down bolt.
  • "No Letter/Blank Space" and valve bodies cast with a letter "A" are considered early.
  • Valve bodies cast with a letter "B" or "C" are considered late.

The red arrow indicates the casting location.

Check for B5 Spring

In model years '05-later, all Nissan and most GM/Volvo valve bodies may have a spring under the B5 control valve. It is very important to check the 10th digit of the VIN to verify production year. If the 10th digit of the VIN is 5 or higher, check your original valve body for a B5 control valve spring as shown. CAUTION: The wrong valve body will cause shift quality concerns.

Remove the 2-bolt end plate and check under the B5 control valve to see if there is a spring.


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AW 55-50/51SN Solenoid Bracket Identification & Installation

Contact a Sonnax Distributor to purchase this part.