I've got a Thwump

[jsevern]

Hey all. I need some of your wisdom. I've got a thwumping sounds coming from the Mustang. The brakes are working fine, the drive shaft is intact as well as the U-joint. There is nothing wrapped around the driveshaft either. When the car moves forward there is a thwump that occures repeatedly, it sounds as if something is wrapped around the driveshaft but that is not the case. The clutch engages correctly and the tranny seems to be fine (there is a bit of a whine in the tranny but it shifts in and out of the gears just fine-it's a 3-speed manual). Any ideas? Motor Mounts? Clutch Noise? Suspension? I am open to hear your thoughts.

Thanks,

Jeff

 

[66200i6]

How about the tires. Look for a deformation on the sidewalls, inside and out.

Good luck, Ric.

 

[ludwig]

How old are the tires and how long has the car stood in one place. I'm thinking a flat spot. Test for it by swapping the wheels back and forth.

 

[jsevern]

Hey guys. Thanks for the ideas. The wheels and tires are brand new. I put them on in November. Keep sending your ideas.

Thanks.

 

[jsevern]

Upon further review (sounds like a football game) I checked my wheels and not only did I lose a lug on the front passenger side but I also had to tighten up every single bolt on the other 3 wheels. The thwumping sound is no longer. Thanks for all of your wisdom and the grace of God.

Jeff

 

[CobraSix]

That'll do it for sure! been there...done that.