Sonnax enhanced performance accumulator spring provides firmer 1-2 shifts for the enthusiast that appreciates quick, positive shift feel in listed GM units. The Sonnax spring design provides a performance shift feel but does not reduce accumulator piston travel. This allows for a firmer – but still cushioned – shift that minimizes shock to the band and shafts.
The Sonnax spring achieves the same effect as the common shop practice of replacing the OE 1-2 accumulator spring with the THM 350 direct accumulator piston spring. The Sonnax spring also may be used as a replacement for the THM 350 direct accumulator piston spring.
In ‘95-later units, install with the spring against the housing.
HEAVY DUTY (FIRMER) SHIFTS / BETTER BAND APPLICATION
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