Just picked up this grand and when you press the brake hard
It makes the wierd pulsating plasticky noise under the dash?
I've heard twice when hitting a bump also.
I've looked at everything and can't find anything. Banging
My head off the wall. I have a video that I could post, just don't know how!

 

Hard to tell what it is by that description. Could be a lot of things. But I have seen a few of those where the shift cable has fallen down and will rub on the front drive shaft when the brakes are applied.

 

Thanks! Ill crawl underneath there again.

 

It was the shift cable rubbing the front drive shaft!
Thanks for the help! Is there something that's suppose to hold that up?

 

Nice! I can't remember. It has been a little while. I think it just droops over time. I think there is a bracket there it can be zip tied to.