So other than being harsh, there weren't any clanks from the rear end previously?

If that is the case, you might've gotten a bad shock in back. Some of the Boge OEM replacements have been discussed as rattling on the board previously - search the archives. If the noise isn't caused by the new shocks, you've got a couple of bushings to look at in the rear that cause banging and clunking - rear trailing arm bushings (RTABs) can be suspect - and from your sig at 285k, they may be due for their second change if they were initially changed at 150k. Likewise, your torque rod bushings can make a racket, but with your other upgrades, you may already have poly there.