Hello forum! I have a problem. My stepdad's transmission just went out. The vehicle has about 180k miles on it. The transmission doesn't want to shift, and when it does it's highly inconsistent, the RPMs want to stay high and not shift, and then when it does it clunks hard into gear. The mechanic wants $3500 to rebuild it. That seems totally crazy to me. I would be happy just finding a fairly low-mileage tranny and finding a mechanic to swap it in for me. I do a lot of my own auto maintenance, but replacing a transmission is Probably beyond my skill level. Where would you guys look for a good deal on a used transmission?