I realized that there is a noise under my car about 2 months now.

The noise appeared only when I accelerate. When it accelerate, its like a big piece a metal drop down an inch and hit something. It has sound when the road is flat.

I went to 2 mechanics and they couldnt find out what happen. Most likely they look for the wheels to see any loose parts. I replaced my ball joint and front shocks about a year ago. I just replaced my right upper arm. The noise still exists. Its right at my center arm rest in the middle. I suspect its the propeller because it’s a rear wheel drive. I went to look at the parts; it contains lots of parts...
I don’t know about cars.

Does anyone have any ideas and where to look for? Thank You!

 

check your exhaust clamps. does it mostly happen after the car is warmed up?

 

The clamps are ok, this happened after I drove 30 miles from work.

 

Tranny mount possibly?

 

Maybe rusted out heat shield,Happen on my car,Make this sound when i step on the gas,i cut it off and no more sound,Check all the heat shields,check the ones on top of the mufflers too,

 

Thomas, do you know what is the part number for the tranny mount? I am going check it out.

I checked the shields and are in good shape.



I afraid its the differential problems!!!!!!!!!!!!!!!!

 

you have an aftermarket exhaust?

 

I have an OEM exhaust.

 

Did you check motor mounts real good. You can't tell by looking especially the drivers side since the oil filter is right above it and they are normally covered in oil. Pop your hood have a friend watch the motor out it in drive and power brake not to much but it'll be obvious is the drivers side lifts up rapidly that's it

 

If you think it's the differential, when was the last time you drained and refilled it?