I had a clunking noise in my van during left turns when I first got it. I
didn't know anything back then(still don't) and took it to a shop. They said
it was the axle and replaced it. It's been fine since.
Your problem sounds a little different if it's doing it when you drive
straight, but I figured I'd throw it out there.

On Mon, May 9, 2011 at 10:40 AM, george jannini <georgejoann@gmail.com>wrote:

> Re, shock bushing:
>
>  When my bus was new to me, the clunking from the right rear turned
> out to be a worn out lower shock bushing, which no amount of
> tightening can fix. (verified by grabbing & wiggling)
>
>  A seta KYBs from Busdepot way back when were among my first ever
> online purchases.
>
> George/ATL
>