terrible clunk and lurch when starting. 2006 auto wrangler unlimited
My 2006 wrangler unlimited (33K miles) with automatic has just started having a problem. It occurs when starting from a dead stop and accelerating to 1 or 2 mph at which point there is a terrible clunk (metal on metal) sound from the rear and a jerk. Both times I thought I had been rear-ended! It's definitely not the brakes and I'm guessing it's in the differential.
It first occurred on 12/24. It occurred again on 12/27. So only two times but I've been doing lots of driving. Both times were nearly identical. I was stopped at a light and started accelerating. If it makes a difference, I've been doing a lot of 4H driving here due to snow but in both of these situations I was in 2H mode. (I've done some limited off-road driving but none recently; the last time was back in August 2008.)
I'm taking it to the dealer on Thursday (12/31) but hate to go there with an undiagnosed issue.
Thanks in advance for any ideas.