1995 Buick Regal Gran Sport

My car suddenly
started making a clacking/clicking sound on the front
end underneath. When I hold on to the gear shifter, I
can feel it vibrate as the clacking happens. It happens
in all gears including neutral when the car is moving,
but stops when the car is stopped. Engine runs great
and will drive, but I’m afraid to do more damage. I
tried turning in motion to see if it is a CV joint, but
don’t get the typical popping. The boots look fine. Any
advice would be helpful. I won’t bother fixing it if the
transmission is going out.