The mechanic doesn't want to do the work. I have a buddy who is one and I do a lot of side work myself. It'* common that if you don't want a job, overprice it. Then the customer will usually find a better price, if they did decide to have you do it. Then it would be well worth your time.
A trans shop would probably take 1-2 hours to get it out, 1-2 hours to fix the issue and 2-3 back in and road testing. On the high side I figure that at 7 hours of labor. Anything over $700-$1000 is overpriced IMO.
00 Regal GS: All kinds of cool stuff.