September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
Symptoms:
- 2-3 Quality poor
- 3-4 Harsh
- 4-5 Harsh
- B1 Clutches burned
- Low Reverse pressure
- B2 Clutches burned
- C2 Clutch burned
- High line pressure
Cause:
Excess wear of OE shift pressure control sleeve allows critical SLS pressure to exhaust, resulting in driveability concerns.Correction:
Recover hydraulic control and renew shift performance by installing Sonnax drop-in shift pressure control plunger valve kit.55-50SN,55-51SN
Shift Pressure Control Plunger Valve Kit
Part No.59947-75K
Also fits AF23/33 and RE5F22A units.
You need this if... View Instructions Find a DistributorThe shift pressure control plunger valve in Aisin AW 55-50SN and 55-51SN units utilizes shift control solenoid fluid pressure (SLS) to regulate the inboard shift pressure control valve. This controls Drive and Reverse fluid pressure to manage second clutch (B2), second coast clutch (B1) or direct clutch (C2) application.
The constant oscillation of the valve within the sleeve creates wear, allowing crucial SLS pressure to exhaust. This can result in shift concerns, high line pressure and burnt clutches. Installing Sonnax shift pressure control plunger valve kit 59947-75K restores hydraulic integrity to this circuit with upgraded materials to prevent future deterioration.
- Hardcoat anodized aluminum valve combats premature wear
- 袖manufactured from highly wear-resistant aluminum for added durability
- Drop-in Zip Valve™parts install quickly and easily
- Valve
- Sleeve
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on.See all Sonnax valve body layouts.
Aisin AW 55-50SN, 55-51SN Valve Body Layout
December 22, 2014
Aisin AW 55-50SN, 55-51SN, AF 23/33, RE5F22A Vacuum Test Guide
You need this if...
Prior to removal, the inboard shift pressure control valve should be checked for excess wear by vacuum testing (Figure 1). If testing at the port indicated fails to hold the recommended minimum in-Hg, replace with Sonnax shift pressure control valve kit [59947-38K].
If shift pressure control valvepassestesting, proceed to test shift pressure control plunger valve and sleeve (Figure 2). If testing at the port indicated fails to hold the recommended minimum in-Hg, install Sonnax shift pressure control plunger valve kit 59947-75K.
