55-51SN, 55-50SN Remanufactured Valve Body AW55NL
Volvo/Nissan, ’05-Later, with B5 Spring. Also fits RE5F22A units.
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Remanufactured Valve Body
55-51SN, 55-50SN Remanufactured Valve Body AW55GE
GM, Early, “A” or No Letter Casting. Also fits AF23/33 units.
Valve Body
(View Valve Body Layout Diagram)
B5 Control Spring 59947-33
Also fits AF23/33 and RE5F22A. Only some '05-later units were equipped with a control spring in the B5 clutch control valve lineup.
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Helps cure:
- Incorrect valve body calibration
- Missing B5 control spring
- 2-3 Harsh
- 3-2 Harsh
- 2-3 Flare
- 3-2 Flare
LPC Accumulator Piston Kit 59947-LPC
Lockup Control Valve Kit 59947-03K
Lockup Relay Control Valve Kit 59947-01K
O-Ringed End Plug Kit 59947-21K
Oversized B4 Release Valve Kit 59947-26K
Also fits AF23/33 and RE5F22A.
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Helps cure:
- 2-3 Flare
- 2-3 Neutral
- 3-2 Harsh
- 3-2 Neutral
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Tooling:
- F-59947-TL26
- VB-FIX
Oversized Lockup Control Valve & Boost Valve Kit 59947-29K
Also fits AF23/33 and RE5F22A units.
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Helps cure:
- Harsh downshifts
- TCC apply & release concerns
- RPM surge on coast
- TCC codes
- RPM surge on light acceleration
- Overheated converter fluid
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Tooling:
- F-59947-TL29
- F-15741-TL29PL
- VB-FIX
Oversized Lockup Relay Valve Kit 59947-77K
Also fits AF23/33 and RE5F22A.
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Helps cure:
- No lockup
- TCC apply & release concerns
- Delayed lockup
- Burnt converter
- Inadequate lubrication
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Tooling:
- F-97741-TL20
- VB-FIX
Oversized Neutral Relay Valve Kit 59947-35K
Also fits AF23/33 and RE5F22A.
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Helps cure:
- Delayed Forward
- Increased throttle required for engagement
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Tooling:
- F-59947-TL34
- VB-FIX
Oversized Pressure Regulator & Boost Valve Kit 59947-12K
Also fits AF23/33 and RE5F22A.
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Helps cure:
- Soft shifts
- Delayed shifts
- Delayed engagement
- TCC apply & release concerns
- Harsh shifts
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Tooling:
- F-59947-TL12
- VB-FIX
Oversized Secondary Regulator Valve Kit 59947-16K
Also fits AF23/33 and RE5F22A units.
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Helps cure:
- TCC slip
- TCC surge
- Overheated fluid, bushings & converter
- Poor shift quality
- Harsh Reverse
- Low lube oil flow
- Bushing failure
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Tooling:
- F-59947-TL16
- VB-FIX
Oversized Solenoid Modulator Valve Kit 59947-34K
Also fits AF23/33 and RE5F22A.
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Helps cure:
- Low line pressure
- 2-3 Flare
- No 3rd
- No 4th
- No 5th
- Delayed Forward
- 5th Gear only
- No lockup
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Tooling:
- F-59947-TL34
- VB-FIX
Shift Pressure Control Valve Kit 59947-38K
Solenoid Relay Valve Kit 59947-05K
Solenoid Wire Connector Retainer 59947-60
Also fits AF23/33, RE5F22A, Volvo (AM6), Opel (AF40), Peugeot (TF80), Saab (AF40/6), Land Rover (TF80), Ford (AF21), Mazda (AW6A-EL).
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Helps cure:
- Broken solenoid connector
Zip Kit® AW55-50SN-ZIP
Tech Resources
January 25, 2023
Uncovering the Root Cause of Pressure & Complaints – The Critical Role of Solenoid Modulator & AFL Valves
Maura Stafford
July 01, 2020
Always Identify These Valve Bodies BEFORE You Start a Transmission Rebuild
Andrew Jessiman
April 21, 2015
Adapt & Overcome: Considering Control Module Adaptation During Diagnosis & Repair
Brian Wing
December 22, 2014
Aisin AW 55-50SN, 55-51SN, AF 23/33, RE5F22A Vacuum Test Guide
December 12, 2014
Aisin AW 55-50SN, 55-51SN Valve Body Layout
July 08, 2014
Transmission Report: Hit a Home Run Against 55-50/51SN Problems
January 01, 2013
Volvo 55-50/51SN Electronic Functions
January 01, 2013
55-50/51SN Valve Body Identification
January 01, 2013
Nissan 55-50/51SN Electronic Functions
January 01, 2013
Aisin AW 55-50/51SN Pressure Tap Locations
January 01, 2013
Saab 55-50/51SN Electronic Functions
January 01, 2013
GM/Saturn 55-50/51SN Electronic Functions
January 01, 2013
55-50/51SN Solenoid & Bracket Identification
January 22, 2011
Aisin AW Linear Solenoids
Bob Warnke
October 22, 2010
Manual Valve Confusion
Jeff Parlee
August 24, 2010
A Box, in a CAN
Serge Martin
April 30, 2010
AW 55-50 No Reverse & VW 09G No Move
Jeff Parlee
January 26, 2009
AW 55-50SN: Join the Club
Bob Warnke
October 28, 2008
Troubleshooting the AW 55-50SN Family
Bob Warnke
October 26, 2008
AW 55-50 / AF23-33: Diagnosis and Valve Body Information
Bob Warnke
July 31, 2008
AW 55-50 Differences Between Manufacturers - Part Two
Jeff Parlee
February 26, 2008
Adapting to the AW 55-50SN Valve Body
Bob Warnke