Here's what I got, a 91 k5 stock blazer with 33's. I was wheeling last weekend and as soon I put it in 4WD and moved I got a klunk klunk klunk. I heard it forward and in reverse. I put it back in 2WD and it was fine. My plan is to take it to Rowland Power Train here in jville. They have the best reputation in town. My questions are: 1. Should I go to a performance shop? 2. Is it just the U-joints in front of the transfer case? 3. Does this make any sense? 4. Locals? Is Rowland Power a performance shop? I'm still a newbie to the 4 wheeling world.