Hard to tell on the video, but it sounds like an alignment issue to me.

 

Almost sounds like a belt slipping. Maybe try stopping, unhooking belts, take short drive and still see if it happens. Water pump bearings maybe? Maybe a bad pulley? Very strange. Good luck.

 

Couple of things to check would be an alignment problem as stated when tires warm up they appear to be wonky somehow!. Since it appears where you live, these are not a common car , maybe lacking in their ability to set up the front end properly!

 

I had a similar screeching sound that turned out to be a vacuum leak from my intake manifold. It sounded like a squealing fan belt. How about getting in a safe area, and when the noise starts, put the car in neutral and shut off the engine. That would at least eliminate engine and transmission (but not rear end). Also, I've heard U-joints that were noisy, but they generally made a clicking noise.

 

Well right off the bat your tires are rubbing and you said you need an alignment...plus that noise seems to get worse when you go around a corner. So that's probably the issue. What size wheels are you running?

 

Definitely sounds tire related to me. Either the alignment is way off, the tires are not inflated to the correct pressure or both.

 

Difficult to hear from the video. Do you have a GoPro or any action cam you can mount at different locations to "see" and "hear" the noise. Can help to pin down the location (engine bay, lift or right wheel, ect.) Do you have power steering? If yes, is everything setup properly?

 

sounds like tires to me. Some part of the alignment is way off.

 

I agree, front alignment issue.
Before taking it to a different shop have a friend drive it in in the same area, speed that the noise is most prevalent - while you stand on the side of the road or street corner,,

 

1 or more wheel bearings going dry maybe. That other constant whirring noise that is not so loud sounds like bearings too or maybe something in the third member which has a bunch of bearings also. When they are dry they will squeal louder as you roll down the highway more because they get hot. That would also explain why it only makes these noises when you are rolling.

 

Well, for starters, you're driving on the wrong side of the road. HAHA!! Just kidding!
I'm still thinking it sounds like a wheel bearing is shot. I also don't think I would drive it any more until I pulled the wheels and inspected and / or changed them so you don't ruin a spindle. I had one make a noise like that as a youth on my way home from a date, and it was far enough that by the time I made it home the inner bearing had gotten so hot it welded itself to the spindle and it had to be split to get it to come off.

 

Any chance that could be an intermediate power steering pump lockup? It does sound like a belt moving across a pulley that is sticking or momentarily stuck. Or, could be low fluid in power steering reserve; it could make the same sound. Just my 2 cents or 2 farthings.

 

My '67 made a very similar noise when my lower control arm eccentrics slipped and messed up my alignement. It was the tires squealing. I have eccentric eliminator plates on it now.

 

The screech is because you are driving on the wrong side of the road and the Mustang knows this.

 

@kiwi66 I found that the fuel line grommet leading in to the engine bay was missing. The hard line would rub against the sheet metal making a similar sound, but not all the time.

 

I vote also for a problem with alignment or a worn part in the front suspension. The noise sounds like a tire being drug along as the tires aren't pointing the same direction. Tie rod end? Dave R.

 

Hi All,

A lot of people said alignment issue so I decided to replace the passenger side tie rods (inner & outer) today. The driver side was done recently (I know I should have done the lot at the same time but didn't realise I had the parts buried in the shed until the other day). I have to get everything from the U.S which takes weeks :-(

All went well until I found that the new inner tie rod bolt & nut were a different size to the old one. I have double checked the part (bought from CJ Pony Parts about a year ago) and it should be for a 1966 V8 with power steering but as the new one is a smaller size bolt & nut I wonder if its really for a straight 6. I test fit it to the center link but it seems like there would be too much play to be safe AND the cotter pin would be way higher than the new castle nut if it was tightened down, although the unthreaded shaft of the bolt does seem like it would be ok.

Mustang Tie Rod End Inner RH Manual/Power Steering/LH M/S V8 1965-66 (cjponyparts.com)

Do I have the wrong part ?

 

Hard to know from a photo but they do look like the 6 cylinder ones to me or something that is smaller than what you need. Getting the wrong parts from a supplier is part of the fun of working on an old mustang,,,,,unfortunately.

If it were the outers you could have an early mustang new tie rod and a brake conversion using a later spindle like 70 or 71. The outer tie rod bolts were larger on the later ones. I did this exact disc conversion on my car and I forever now have to remember to get outer tie rods for a 70 model car. This issue is only the outer ones though so it doesn't work that way on the inner ones.

 

Cheers - Its fun, but I having to wait 7-10 days or more for a delivery is very frustrating.

Hopefully the parts I have ordered (this time from rockauto) will be what I need and I can finally close the investigation into the weird noise

 

Fixed!!

The new outer, inner tie rod & sleeve arrived today and as it had stopped raining I got straight into it.

Replaced the both tie rods on the passenger side and did a 'home' alignment using some jack stands and some string. Set the toe in at about 3mm and went for a drive. The sound is gone!!!!

I'm sure it needs to be properly aligned but just having the sound gone is good enough for me at present. As is always the case, the simplest solution is probably the correct one. At least the car has new belts, power steering pump & alternator

Thanks to everyone for their comments and advise.

Now on to find why the new 1 wire alternator doesnt actually charge the battery ;-)

 

Fixed!!

The new outer, inner tie rod & sleeve arrived today and as it had stopped raining I got straight into it.

Replaced the both tie rods on the passenger side and did a 'home' alignment using some jack stands and some string. Set the toe in at about 3mm and went for a drive. The sound is gone!!!!

I'm sure it needs to be properly aligned but just having the sound gone is good enough for me at present. As is always the case, the simplest solution is probably the correct one. At least the car has new belts, power steering pump & alternator

Thanks to everyone for their comments and advise.

Now on to find why the new 1 wire alternator doesnt actually charge the battery ;-)

Glad you got it worked out.