Nissan Repair: TPS code ignored on a 2000 Nissan Quest, transmission repair shop, miss dallas

Question
12 days ago as I was driving about 35-40 mph I heard a clunk after taking off from a red light when the car tried to shift out of 2nd gear (I believe). I pulled over right away and drove very slowly, about 15 mph home (2-3 miles). Took it immediately to a transmission shop assuming it had transmission problems. Had a T.P.S. code. They told me the issue wasn't external they had to open it up to find the internal problem. After keeping my car for 11 days and charging me $2600 to replace the Solenoid and Torque Converter the car drove exactly the same as when i left it there!!! Took it immediately to my regular repair shop, they fixed the TPS issue in about an hour and said they never should have worked on my transmission before first seeing if replacing the T.P.S. fixed the issue. Should the transmission repair shop have fixed the T.P.S. first and then I may not have had to pay to re-build the transmission? I only drove it a few miles (live in Dallas and the repair shops are on every corner) after the initial problem and drove it slowly so I don't believe the TPS issue could have ruined the transmission as they say. Thank you for your help!

Answer
Denise,

I could not tell you if one hurt the other.  But, since it is at ten years there could be two things failing at once.  I do not think the TPS could take down a transmission.  But, what I am saying is that both could have failed close to the same time.  I had a torque converter fail and it just quit on a Camry I had.  I would have your shop take it up with the transmission shop if they feel strongly about the situation.  Since I am on-line there is no way for me to tell.  But, you are a lucky lady living in Dallas.  I am from Dallas and live in Las Vegas now.  I do miss Dallas.