I understand that it may be running, but that doesn't automatically mean that the transmission is in good condition.
Case and point, a couple years ago I had the T5 in my Firebird rebuilt because of a pilot bearing failure. It, too seemed to be functioning fine but when they got it apart, it was simply worn out. I saw the parts, and agreed. Since it was out, and apart, I opted to have it completely rebuilt. Could it have been reassembled as it was? absolutely. Would it have lasted a while longer? Most likely. Would it have been the best call to simply have it reasembled? Since labor is the majority of the cost and it was already apart, no.
So did they give you a reason for the price increase? Or did they just change the price without even looking at the transmission?
Lawrenceville, GA