Often, when stopped at a red light in my 07 Tacoma TRD 2WD, the auto transmission has a noticeable clunk when the brakes are on and the truck is not moving. Sometimes I can also see and hear the engine rpm change. It seems like the transmission may be downshifting to 1st gear while stopped. I've never had a transmission do that after I stopped.
I've read the thread on axle wrap that sounds similar. But I don't think that is the problem because I'm not moving. One reply in that thread suggested that this might be a torque converter issue. Could this be my problem? If it is, does anyone know if it would be covered on the 60K driveline warranty (I have 56K on the truck now?