I don't normally drive this car as it is a beater car for my wife but I have had to work on it and today when I took it for a test drive and accidentally hit the gas pedal too hard on take off there was a sever thud coming from the drivetrain. I noticed this the other day too when she took me somewhere and there was a thud on the passenger side toeboard I could actually feel.

The car is old at 22 years and has about 125K miles on it. I just don't want to go parts changing to find out the last thing solved the problem The car drives OK and I had the car aligned only about 5K miles ago when I had to replace the rack and pinion and they did not mention the LCA bushings as being bad which I would assume would show up to someone doing an alignment, but I am not sure. There is not clicking or torn CV boots and there are no drivability issues except hard take offs or hard upshifts which is actually what I just fixed.

What is the best way to determine if it is the motor mounts or one of the other possible causes? I'm a classic car guy and I don't have a ton of experience with front wheel drive so I am wondering what the procedure to check the motor mounts would be?

Thanks for any help here.