Post #47 (first one)
That loud snapping sound is an exhaust leak. An exhaust leak doesn't hurt anything but your ears... but you don't want to drive around like that. The exhaust manifold gasket or the EGR J-pipe gasket are the usual suspects.
Manifold gasket
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EGR J-pipe gasket
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Replacing the EGR J-pipe gasket is pretty easy. Might as well try that first. Otherwise the manifold has to come off to replace the manifold gasket. If you've never done it before, you can get it off in a day.... A few other things have to come off first before the manifold can come off. Everyone who has done it, had to do it for the first time ... sometime. So might as well join the club.
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Transmission Noise:
First make sure that the transmission (and transfer case while you are at it) is full of oil-
If you don't know the last time it was changed and it is black, change it.
When the clutch pedal is out and the tranny is in neutral, everything inside the transmission is spinning around. What you may be hearing is transmission bearing noise (aka worn bearing noise).
If you press in the clutch and the noise goes away, then the sound is transmission bearing noise.
Drive it over to any transmission shop and have them listen to it. They'll tell you what they think it is.. and it won't cost you anything.