Since its introduction in 1969 with the 428 SCJ, the R code servo has remained the trick piece for C6 builders needing additional band apply force. Sonnax R code servo kit K36528R for C6 (mid 68-later) units features a no-leak pin which uses one O-ring and one PTFE ring to eliminate back pressure and leakage due to worn case bores. A replacement seal kit K36528R-SK also is available.

More than 9 square inches of apply surface for more band apply force
No-leak servo pin design allows the servo piston to be used in worn bores
Two selective return springs allow for tuning of shift quality

More From This Category

Sonnax Channel Plate Sleeve, GM, 4T40E (95-Up), 4T45E, Each

Sonnax Channel Plate Sleeve, GM, 4T40E (95-Up), 4T45E, Each

$36.76

Motive Gear Differential Master Bearing Kit, Timken, For CHEVROLET K2500 1989–1997, Kit

Motive Gear Differential Master Bearing Kit, Timken, For CHEVROLET K2500 1989–1997, Kit

$362.56

TCI Automatic Transmission Rebuild Kit, Master Racing, For Ford, For Lincoln, For Mercury, C-4, Kit

TCI Automatic Transmission Rebuild Kit, Master Racing, For Ford, For Lincoln, For Mercury, C-4, Kit

$409.03