What is this knocking sound? Its seems to happen when I give the car sudden throttle from slow speeds.

Video of front drive shaft cv:


Video of front wheel:

 

Can't hear whatever you are concerned about from your vids.

Good luck.

 

Raise front wheels off the ground and check front driveshaft cv joint, look/listen at :35 here:

 

Think im getting closer... at 2:52 you can see the front diff rise up and flick back down causing vibration in the under guard

 

Rear diff bushing, either side diff bushing would be my guess if everything else is tight. Have you checked the mounting bolts to the frame on the front diff mounts?

 

You should have a ((((((warning "brake squeal"))))). Replace those brake pads ASAP! My ears are still ringing listening on my 7.1 surround connected to my pc.
Did you get under and inspect/check front diff bushings and propeller?

 

Here is a video of the front diff bushing. You can see it really moving up and down.


I only recently put this new bushing in so I'm thinking I installed it wrong or maybe its poor quality.

Am I right this is the problem?

 

Yep, I think you found your issue. There is supposed to be ability for "some" movement, but you have way too much.

Do it up right here.... H3 D.I.Y. FRONT DIFFERENTIAL BUSHING KIT

 

That looks scary. Do the engine mounts need to be changed also? (The oil pan is swinging over big time.)