Transmission mount, motor mounts or exhaust rubbing somewhere.

 

Check the parking brake cable and see if it's close to the exhaust or driveshaft.

 

I had something similar to this in my 69. Turned out it was slightly loose transmission mount bolts, the long bolts that hold the mount to the unibody.

 

I've checked the trans mounts and motor mounts recently and both are tight and in good condition.


It is a power steering, power brakes car.

Oh... and this noise is new, it only started a couple weeks ago.

 

If the car is in park or neutral or driving, no sound. In drive and stopped or braking, noise.

sorry, i have no idea what this means.

if it grinds while braking your brakes are likely metal to metal. if it makes noise or vibrates slightly when stopped, it might be the exhaust hitting the body.

if it only makes noise when your foot is on the brakes or makes more noise when your foot is on the brakes, then you have power brakes and you have a leak which is most likely in the booster.

 

sorry, i have no idea what this means.

if it grinds while braking your brakes are likely metal to metal. if it makes noise or vibrates slightly when stopped, it might be the exhaust hitting the body.

if it only makes noise when your foot is on the brakes or makes more noise when your foot is on the brakes, then you have power brakes and you have a leak which is most likely in the booster.

Start car, car in PARK, no noise. Doesn't matter if foot on brakes or not.

Put car in neutral, no noise. Doesn't matter if foot on brakes or not.

Foot on brake (while stopped) put car in DRIVE, noise.

Take foot off brake and start moving, no noise.

While coming to a stop (at low speeds), noise.


I'll post a video if that'll help.

 

I also don't quite understand that statement.

 

Here is a VIDEO.

The car is not moving.

I am alternating between neutral and drive. My foot is on the brake the entire time. The noise is only heard when it's in drive.

View My Video


Video - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting

 

Definitely sounds like movement of the engine/transmission on the mounts due to torque is causing interference with something. Fan to shroud? Exhaust to driveshaft? Exhaust to brake cables? Tranny dipstick to firewall?

Grab your flashlight and slide underneath and look at the places where there are tight clearances. Look for evidence of rubbing. Look for stuff that could be vibrating, like tranny cooler lines popped loose from clamps, etc.

 

Definitely sounds like movement of the engine/transmission on the mounts due to torque is causing interference with something. Fan to shroud? Exhaust to driveshaft? Exhaust to brake cables? Tranny dipstick to firewall?

Grab your flashlight and slide underneath and look at the places where there are tight clearances. Look for evidence of rubbing. Look for stuff that could be vibrating, like tranny cooler lines popped loose from clamps, etc.

DING DING I think we have a winner.

Transmission dipstick was sitting up against the valve cover. I moved it back in place and the noise seems to be gone.

We'll see if it comes back.

TY

 

Bleh... spoke too soon. Noise is back.

I guess I'll keep messing with stuff until I find the issue.

Another possible culprit: passenger side brake line. I can see where it was rubbing on the shroud above the a/c connection the firewall.

 

hey man!
How did you fix this problem ? i have the same exact noise in my 06Mustang .

 

Reviving this thread, having an identical issue on my 68- anyone else ever find the solution here?

 

I still got my money on Trans mount. I had this issue on my 65 and visually, the mount looked fine. But I replaced it anyway because it was $15 and once I had the old one out and compared the two, it seemed that the old one had collapsed. Just spit ballin here, but given the symptoms, it seemed similar if not the same as my issue.

 

Got it up on a lift today, transmission wouldn't move no matter how hard I tried. Mount could still probably be replaced honestly - but by the looks of it, my exhaust was touching my transmission pan so maybe that was the noise? It's actually at the exhaust shop now, headers are being altered to steer clear of the transmission pan as well as new cans and side exhaust - who knows maybe the sound will go away. Will report back on my drive home today (or tomorrow if they don't finish) but it is going to the transmission shop next Thursday for some checks.

 

Coincidentally, I have one under the passenger's floorpan. It's been there for a number of years. Just never had the incentive to chase after it.

 

Yeah, this isn’t just a rattle, I can tell it’s something mechanical but the way it feels in the car when it makes the sound