A hydrodynamic coupling arrangement (1), comprising an impeller (6) linkable to a drive shaft, a turbine (7) linkable to a driven shaft via a hub (11) and able to hydrodynamically coupled with the impeller (6), a lockup clutch (20) able to short-circuited the hydrodynamically coupling between the impeller (6) and the turbine (7), a torsional vibration damper arrangement (13;14,15) located between the lockup clutch (20) and the hub (11), said torsional vibration damper arrangement comprising an input element (16;17,47,24), an output element (17; 25,33,32) and a plurality of elastic elements (22;26) disposed between the input element and the output element, the output element of the torsional vibration damper arrangement forms a part of the hub, wherein the coupling arrangement comprises an absorber device (29) being linked in rotation to the hub, said absorber device comprising a unique resonance frequency.

A method of making a wet friction material includes coating a first outer surface of a cellulose layer with a friction coating; placing a matrix of fibers and filler particles on a second outer surface of the cellulose layer; and saturating the matrix of fibers and filler particles with a binder and curing the binder to join the matrix of fibers and filler particles together to form a wet friction material base layer and to join wet friction material base layer to the second outer surface of the cellulose layer.