knocking floor board

[dvast8n]

This might be the dreaded clunk but thought I'd ask anyways.

About 2 months ago I installed LT headers, mid-pipe, catback and H&R race springs. I did drop the K-member to install the LT headers. Not to long ago if you started from a stop and gave it a little gas (enough to get up to traffic speed fairly quick) it felt like there was someone knocking on the floor board. It lasts for about 1-2 secs. It seams to come from the driver's side. During spring install I lowered the IRS down to install the rear springs.

I think it could be a few possabilities. 1. Driver's side header is knocking on the sub-frame or 2. Dreaded clunk 3. Pinion angle off?

Any opinions? :shrug:

 

[ShelbyGuy]

when i melted the diff bushings off (factory set, and a poly set) it feels like the diff is trying to jump into the back seat.

crawl under the car and start checkin stuff out....

 

[dvast8n]

when i melted the diff bushings off (factory set, and a poly set) it feels like the diff is trying to jump into the back seat.

crawl under the car and start checkin stuff out....

I'll check it out. It's more down by my feet.

 

[sprusak1]

my pass. muffler was making a similar sound, it was just hitting the sub-frame.