I just received Toyota's 2007 Genuine Remanufactured Parts Guide in the mail. For a 2000 LC with the model A343F transmission, the reman transmission part number shown is 35010-6A020-84. It comes with a 12-month unlimited mileage warranty and includes the torque converter. The core value is $1,400 and it must be returned in the Toyota shipping container, fully assembled with no missing parts or external damage. If this part number is entered into the
www.toyotapartscheap.com web site, the MSRP is $2,673.72 and their price is $2,138.98 with a $1,000 core value.
I'd be interesting in knowing the history of the vehicle. I'm skeptical of the "no codes" story from the dealer, especially for an intermitent problem. This is a sophisticated transmissin with codes for damn near everything. Did you check the transmission fluid level and give it the sniff test to see if it smelled burnt?
If the transmission is truly shelled-out, I'd go the Toyota reman route (be sure the dealer uses a Toyota unit and not a substitute). Your dealer should match the online price above or at least come close. I'm guessing the labor will be at least $1,000.