C-4 C-5 Transmission C Ratio Billet Aluminum Servo Piston Kit Sonnax K13259C Rebuild Kit Brand: SPX Filtran

Brand: SPX Filtran

They require higher drum speeds

All New OEM 5 Piece kit includes:

Manufacturer Part Number: 36948-12

To avoid a "Double-Swap" shift on a 6-4 downshift

C-4 C-5 Transmission C Ratio Billet Aluminum Servo Piston Kit Sonnax K13259C Rebuild Kit Brand: SPX FiltranBrand: Sonnax Type: Servo Manufacturer Warranty: 90 Day Fitment Type: Performance Custom Manufacturer Part Number: K13259C Material: Aluminum Universal Fitment: Yes Vintage Part: No Performance Part: Yes C4, C5 Transmission High Performance Servo Piston Kit "C" Ratio Servo Kit Part No. K13259C Purple Anodized Cover As used with Shelby Mustang and other performance vehicles, Sonnax "C" ratio servo kit K13259C offers greater holding power, giving