You should really hold the brake securely w/ your left foot (you can set the parking brake, as well) and raise the RPM for a continual period of time - roughly 5 to 10 seconds so you (we) can actually hear the noise disappearing. You're just "popping" the accelerator pedal. Get comfortable with it and hold the accelerator pedal to a steady increased RPM for 5 to 10 seconds. The car isn't going anywhere and you're not going to bust anything - it's a test.

 

It grinds the whole time from what I can hear. Bit hard to hear over the exhaust

 

Thanks for that - a much better brake torque test. Puzzling and I don't know what to make of it. I realize you're not in a highway speed cruising condition with an elevated RPM during a brake torque condition since neither the drive shaft nor the wheels are rotating and the effects applied to the TC are not the same - so, the differential between the impeller rotation (pump) & the turbine rotation are not similar to a driving condition and you aren't really dumping any torque but instead maintaining it. Yet, it would demonstrate if the noise increased, decreased or remained the same with an increase in RPM. It would 'appear' the noise remains the same but less 'pronounced' at a higher RPM (during a brake torque condition); yet, at cruising speed it appears the noise is gone (based upon your slow moving rolling speed video). Others will surely chime in, but if my understanding is correct, the stator (located between the impeller [pump] and the turbine) achieves its highest torque during an idle condition (when the stator reverses fluid flow between the impeller & the turbine because the impeller is rotating at a very different speed than the turbine). The torque gets dumped as you accelerate until eventually you achieve a cruising speed. During the period of time you go from an idle condition to cruising speed the speed of rotation between the impeller & the turbine become more similar (less difference in speed) and less torque applied. So, if my logic is correct, during a high torque condition (impeller & turbine are rotating at very dissimilar speeds e.g. idle) you're getting significant noise, but during a low torque condition you're getting far less noise or negligible noise. I'm not a trans guru, others certainly are much better versed. It's a tough call to diagnose. "If" it's related to the TC, my first call of duty would be to examine the mounting bolts of the TC to the Flexplate. At this point, hell, it may resolve back to the starter. Maybe a drive to the guys who changed out the transmission would be in order and have them listen?

 

I appreciate you taking the time to help me out. I will have to find a new transmission shop as I moved out of state since having it swapped. Flexplate felt solid when I tried to move it to check for play. Everything was great until last week when it started on my way back from the store while idling in traffic. I drove it about a mile today and it felt and shifts fine. Hopefully it's something simple.

 

Problem solved. Torque convertor went bad....pushed bunch of metal pieces into the transmission. Had to be fully rebuilt. Everything good to go now.

 

Hope you still have some change leftover for pizza. Glad you got it figured out.

 

Tell me about it. When I dropped it off I was told it's a $500 torque convertor replacement. When I picked it up he said "I forgot to tell you I had to rebuild the whole thing bud"

 

If the converter goes. More than likely the whole thing has to come apart.