I drove my wife's 2000 4Runner Limited 4x4 and noticed a sound coming from the transmission.. It just rolled 157,000 miles so I figured that wasn't good.. Took it to the local dealer and had a master tech look at it and he said the torque converter is going bad.. He said it could last a year but when it goes, it will leave you stranded.. They said a Toyota torque converter installed is about $1800 (ouch!) but they will call around to find an aftermarket converter which might save about $500.. They called back and said there were no aftermarket converters available???? Could that be true?? The vehicle is in great shape so I am going to make the repair and eventually keep it for my daughter to drive but $1800 seems high.. Any thoughts?? Thanks!