Sonnax® B5 Control Spring

Aisin Warner 55-50SN 55-51SN

Nissan Saab Volvo 2001-2013

Also fits AF23/33 and RE5F22A. Only some '05-later units were equipped with a control spring in the B5 clutch control valve lineup.

Only some Aisin AW 55-50SN and 55-51SN transmissions ('05-later units installed in Nissan and GM vehicles) were equipped with a control spring in the B5 clutch control valve line-up. Using a valve body without a spring in those vehicles creates a mismatch between the B5 lineup and the TCM calibration, often causing a harsh 2-3 upshift or 3-2 downshift. Sonnax® B5 control spring 59947-33 is a direct replacement for the OE spring. This allows rebuilders to rebuild any suitable core for use in vehicles where the spring is required, or correct shift concerns caused by a missing spring.

Restores valve train response, matching the TCM calibration

Allows any AW55-50SN valve body to be converted to a spring type application

Symptoms:

Incorrect valve body calibration

Missing B5 control spring

2-3 Harsh

3-2 Harsh

2-3 Flare

3-2 Flare

Cause:

TCM programing anticipates spring control response in the B5 control line-up in certain vehicles. Without this spring, the calibration is mismatched and 2-3/3-2 shift issues may occur.

Correction:

The Sonnax® B5 control spring is a direct replacement for the OE spring and it can be added to any valve body in order to match the TCM calibration.

Sold As Quantity 5 Per Package