| Racer Net: ||$13.78/Each|
| Our Price: ||$11.48|
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Sonnax race-calibrated servo return spring kit 28133-HD for Powerglide units ensures optimum servo function in high gear for longer band life, cooler transmission and tunability of shift.
Designed to overcome the pin bias effect, the Sonnax race-calibrated spring has higher seat pressure to help ensure full servo release, but with a lower rate for greater net apply force.
Specifically designed to work with line pressures from 200 to 275 psi
Includes two .050" shims to aid in tuning at higher line pressures