Door noise/knocking sound

I'm having a heck of a time isolating the cause of a really irritating sort of knocking sound coming from the driver's side door. It's comes on when I'm travelling over bumps in the road and seems to be coming from the area around the window crank but I can't be sure...
I've had the trim panel off for weeks now, trying to use my hand to put a finger on the cause while driving - No luck yet.
I replaced the window regulator with another used one from one a donor truck last week. Seemed to make a difference at first, but back to the knocking again now. Maybe not quite as bad.

Are there any well known causes for a sound like this?
What about these regulators... Both units were fairly loose at the pin to the mounting bracket. How much play should there be in the mechanism?

A very common noise comes from a lack of the plastic on the striker bolt. Do you have plastic on yours?

Gary Lewis wrote

A very common noise comes from a lack of the plastic on the striker bolt. Do you have plastic on yours?

Even if the plastic sleeve is still intact but worn down the door will rattle. I had this issue with the passenger door on my '84. I put a few wraps of electrical tape around it as a test and the knocking sound went away. I later installed new strikers, but the black tape worked for a long time.

Wanna cure a loose door on a Bullnose???....install new door seals lol. I can provide a 100% guarantee that a door will cease to rattle after new door seals are installed...that is if you can even get it closed in the first place lol.

Gary Lewis wrote

A very common noise comes from a lack of the plastic on the striker bolt. Do you have plastic on yours?

Yes, it was the first thing I looked at. But now Cory has me thinking I'll try wrapping some e-tape on there just to see what happens. Thanks Cory!

Lima Delta wrote

Gary Lewis wrote

A very common noise comes from a lack of the plastic on the striker bolt. Do you have plastic on yours?

Yes, it was the first thing I looked at. But now Cory has me thinking I'll try wrapping some e-tape on there just to see what happens. Thanks Cory!

That plastic sleeves on the strikers usually decay and crack and break off/fall off. Sometimes though, they actually stay intact and just wear down and end up with a groove worn in the middle. That's what mine did at least.

What mirrors dose the truck sport?

There is a metal tap? that runs from the inner panel to the outer door skin.
This tab is by the vent window down post IIRC
This tab supports the outer door skin because of the heavy mirrors.
With out this tab the outer skin will flex and crack.
It could be this tab is broken but has not cracked the skin yet and when you hit bumps it is flexing and making noise.

Also the vent window post has a bolt to then inner panel to support it.
If this bolt is loose or the tab on the post broke loose this could be making noise.
Also check this bolt washer that it has not cut the panel where it is bolted to.
Dave ----

Ok, thanks Dave. I haven't tried Cory's tape idea yet, but if that doesn't work at least I'll have somewhere to look. This noise sure seems like it's coming from the area of the door you're describing but it's hard to tell for sure while driving. Whatever it is it sure is irritating.

One temp approach is to raise the striker bolt slightly so that it picks the door up a bit when closing.  If it is rattling at the striker bolt that will reduce the noise a bit and show you that's where the noise is coming from.

Lima Delta wrote

Gary Lewis wrote

A very common noise comes from a lack of the plastic on the striker bolt. Do you have plastic on yours?

Yes, it was the first thing I looked at. But now Cory has me thinking I'll try wrapping some e-tape on there just to see what happens. Thanks Cory!

I installed mine when I hung my doors a month or more ago….I can now close them easier but easier means a firm shutting of the door, and that means just shy of slam.