Front Clutch

Front clutch is engaged at 3rd gear of D range and R range. When it is engaged, reverse sun gear of the planetary gear rotates.

Power flow: 

Input shaft--> Rear clutch retainer--> Front clutch--> Kickdown drum--> Reverse sun gear--> Long pinion--> Ring gear--> Transfer driven gear

Fig 1: Front Clutch Power Flow Diagram

Courtesy of KIA MOTORS AMERICA, INC.