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55-50SN, 55-51SN

Remanufactured Valve Body
Part No. AW55GE

GM, Early, "A" or No Letter Casting

View Instructions

January 01, 2013

55-50/51SN Valve Body Identification

Valve Body Xpress

Topics: Identification Guides Remanufactured Valve Bodies Transmission Aisin AW 55-51SN Transmission 55-50SN Transmission

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January 01, 2013

Aisin AW 55-50/51SN Pressure Tap Locations

Valve Body Xpress

Topics: Diagnostics And Theory Remanufactured Valve Bodies Transmission Aisin AW 55-51SN Transmission 55-50SN Transmission

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January 01, 2013

Saab 55-50/51SN Electronic Functions

Valve Body Xpress

Topics: Diagnostics And Theory Remanufactured Valve Bodies Transmission Aisin AW 55-51SN Transmission 55-50SN Transmission

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January 01, 2013

GM/Saturn 55-50/51SN Electronic Functions

Valve Body Xpress

Topics: Diagnostics And Theory Remanufactured Valve Bodies Transmission Aisin AW 55-51SN Transmission 55-50SN Transmission

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January 01, 2013

55-50/51SN Common Problems After Remanufactured Valve Body Installation

Valve Body Xpress

Topics: Diagnostics And Theory Remanufactured Valve Bodies Transmission Aisin AW 55-50SN Transmission

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January 01, 2013

55-50/51SN Solenoid & Bracket Identification

Valve Body Xpress

Topics: Diagnostics And Theory Identification Guides Solenoid Identification Or Connector Pin Outs Remanufactured Valve Bodies Transmission Aisin AW 55-51SN Transmission 55-50SN Transmission

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October 05, 2015

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

Topics: Rebuilding Tips Remanufactured Valve Bodies

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  • Aw55ge
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55-50/51SN 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.


55-50/51SN Solenoid & Bracket Identification

We receive a large quantity of cores with broken solenoids. Therefore, protect these solenoids when repackaging the valve body core for return. Thank you!

Look for a letter that is cast into the valve body to the right of the S4 solenoid hold down bolt. There will either be no code, an A, B or C.

Bracket Identification

The brackets are different, depending on which valve body fits your application. In addition, these brackets MUST be installed correctly. Always install the SLS/SLT bracket with the narrow side up as the valve body sits in the car. Please install the brackets according to the photos.

No Code
Code A, B or C


Solenoid Identification

No code or code A valve bodies have the SLT and SLS electrical connector facing up. Code B or C valve bodies have the SLT and SLS electrical connectors facing down.

No Code or Code A
Code B or C

Solenoid Wire Color Chart

Solenoid
Connector Color
Wire Color
SLU
Black
1 Green, 1 Brown
SLT
Blue
1 Green, 1 Gray
SLS
Green
1 Blue, 1 Red
S1
Black
White
S2
Black or Gray
Black
S3
Gray
Yellow
S4
Blue or Green
Purple or Red
S5
Green, Red or Gray
Blue or Black