Took a 2000 AWD explorer in after periodically feeling like I was driving over rumble strips. I wasn't able to describe the problem or how to reproduce it very well, though, and I didn't insist on going on the initial drive with the mechanic. In the process of trying to find what I was talking about, he found that my front differential was chewing up the end of the axle and needed to be rebuilt. Upon getting the car back, I was able to trigger the ""shudder"" again and when I got back to Carter's the mechanic jumped right in with me to see what I was talking about. Fortunately I was able to get the shudder to happen again and he knew immediately that it was coming from in the transmission. When we got back, Doug gave me a very reasonable estimate for rebuilding the transmission and discounted down to that $ amount when the actual work came to a little more. So, yes, I did pay for both repairs when I was expecting one, but the prices were very reasonable, the repairs needed to be performed, and they were great folks to work with. The only thing I would do differently would be to insist on going on the initial test drive since the main shudder issue was hard to reproduce and I knew I wasn't describing it very well to them.
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