I posted in the the turbo forums section figuring I would get more automatic swap guys. Just like the title reads, I did a TH400 swap and now I have a knocking noise at idle. Fluid level is set perfectly and no interference with flywheel or torque converter in housing. I have removed the transmission already and checked flywheel bolts and torque converter bolts. No cracks in flywheel. I also cut open the oil filter and checked for metal..... nothing. The only reason I'm posting this is for any crazy ideas I have'nt thought of before I ship the torque converter or transmission out to builders. I've considered starting the engine without the torque convertor installed to make sure its not in the engine. Both the TH400 and Torque Converter are from very reputable companies that most of us are using. I wont say the names because they have been very good to me, and its undetermined so far the issue. Its not a cold or hot noise....it always does it. And oil pressure is 90 @start up and 30 when @ FOT. The noise is there no matter what gear its in. P,N,1,2,3. Goes away at around 1500 RPM.