Hey folks, I've got a 1997 Z71, which I believe has a 4l60e automatic transmission. I've been working on restoring it for hunting and hauling, and I recently replaced the wheel hub assemblies, rotors, and drums, along with some rather cheap winter tires to get me through the winter (Norman 7's by Nokian). I replaced all of those things at the same time, and around that time I started to hear a hum once I hit about 40kph (24mph). It increases in pitch until about 90kph (55mph) when I start to stop hearing it - possibly cause there are so many other noises at that point, lol! At first it was just chocked up to having cheap winter tires, and I figured it was road noise. However, over the last several drives I've noticed the following: - the hum is the same whether driving on wet pavement, dry pavement, gravel, or snow covered pavement. The sound doesn't change based on type of road I'm on. - The hum goes away completely when I let off the throttle and coast in gear (slow down) I'm starting to get concerned that this is some early signs of transmission trouble. It does seem to shift ok, while driving it shift smoothly up and down at the moment. Is what I'm describing ringing any bells? Possibly unrelated, but I'll mention it in case: - I've been getting intermittent engine code error P0719. I've figured its the brake switch itself - and have one on order to swap it out - but I'm also aware that this error can stem from a faulty Torque Converter? I've got no idea if this could even possibly be related to the hum or not? I don't expect people to diagnose on the net, but any insight to the mechanical workings, or advice anyone can provide is appreciated before I take it to a shop for boucoup monies. thanks!