Sonnax performance converter kit FD-RK-22 is a heavy-duty, dampered multi-plate kit that improves holding capacity in the Ford 4R100, 6-stud converter without sacrificing stock shift action. Clear instructions, minimal setup and easy assembly make these foolproof upgrades. All-new kit components eliminate the rework and limitations associated with salvaged parts.

• Fully-machined, forged piston and custom damper rivets won’t bend under extreme lockup pressure
• Piston is tested and proven to withstand bending up to 400 psi
• Spring end caps limit how far springs compress under load to prevent breakage
• Increased oil flow improves cooling and lubrication of clutch plates
• Patented piston/damper assembly absorbs up to 1,250 ft-lb of torque, nearly twice the stock capacity of the Ford 4R100 damper
• Three solid, non-segmented, high-thermal, high-torque capacity friction elements deliver solid holding power