My Bet is the front struts/springs need to be replaced.
I've experienced a "bouncy" front end/ steering wheel in both the TBs' I've owned and each time it was no longer present after installing new struts/spring assemblies.
Most bad suspension parts will make a "bang" of sorts when they wear out. ( end links, ball joints, ect. ) When the struts get old& weak they can no longer control the "bouncy" effect naturally caused by the springs so rather than acting to dampen the bounce,.... the effects gets worse and worse till you begin to actually feel it in the steering wheel.