I'm on a business trip right now and ~200 miles from home. I'm also planning to pull the engine and transmission very soon, so ideally a fix (if imminently needed) isn't expensive or difficult.
I first noticed last week there developed a growl/grumble that followed vehicle speed. While parked I couldn't find anything rubbing anything that turns at vehicle speed; nothing in the brakes or touching either axles or wheels. I figured it might be a CV joint or wheel bearing, and I figured I'd just keep an eye on it.
Today after parking the car I rev'd it in neutral a few times and noticed there is also
now a groaning sound which follows RPM, and sounds to be coming vaguely from around the bell housing, though I'm less than certain of the source.
Here's a video of the latter noise:
I'll see if I can grab one of the noise which follows wheel speed when I go out for dinner.
I've never personally heard a bad ISB before so I have no idea if that's what one sounds like. What concerns me is that both happened about the same time - I'm inclined to believe there's a relation. I'm away from home right now and there's a belly pan on, so short of taking it to a shop I'm not going to get a visual on anything. My first thought was that maybe I developed a slow leak from the transmission and low fluid is causing noise both around the differential/output bearings and around the input bearings, as they're not properly lubricated. Shifting is unaffected though, so maybe I can rule that out.
Anyone ever hear a noise like this? Can I drive the car for a few hundred more miles or does this sound like something which needs to be addressed pronto, even if I'm planning to yank both engine and transmission out in a couple of weeks?