General Maintenance & Repairs - clunk and squeak noise from rear??

i have a hard clunk noise coming from the rear of my car when i hit hard bumps. it sounds like the rear end smacks the body of my car?? i have all new shocks but my springs are original and i was thinking my springs are weak from the 150 k. i also have a sqeauk noise from the left rear of the car when i hit bumps also. both calipers are new along with the rotors and pads. i also put a new rear end in it because my carrier i was bad, but had the noise before that so it can't be an axle bearing. also installed new trailing arms. i can't think of what else it could be.

TTT I have the same problem on my Firehawk does anyone have a suggestion?

Did you do the heater hose mod on your rear springs (along with removing the rubber seperator)?
I have had the same clunking noise ever since I did the mod. Nothing to really worry about. Could also be a loose control arm. Check the bolts down there?