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I lost a wheel weight on our Saab shortly after a balance job... it's certainly possible! Hope it's that simple for you... u-joints are also a good idea to check, and also search "death wobble." Good luck, and keep us posted!

I checked my flywheel first -- no cracks there. I disconnected all drive belts, and that wasn't it, and I replaced the harmonic dampener (it needed it anyway) too. The squeak is still there. I really think that in my case it's the exhaust. My truck is running great -- starting easily on...

Thank you for the suggestion! I have wondered whether my issue might be exhaust-related. I have been underneath and shaken/kicked at the exhaust and never can quite replicate the noise I am hearing, but I'm glad to hear it's not out of the realm of possibility that that's my issue. In fact...

Well, I'm at a loss. I pulled the inspection cover (finally) and see no cracks. I'll look again to be sure my eyes aren't playing tricks on me, but I just can't find a thing. I really need to find another 6.2 to compare the noise levels to. Maybe I'm just used to my VW and Mercedes diesels...

UPDATE: It's apparently not either alternator or the PS pump. I removed the belts for each and drove the truck, and the noise is still there. Time to check the flywheel!

Thanks for all the advice, folks. I think that tonight I'll remove the PS pump belt just to rule that out -- it's the only belt I have no removed in my quest to isolate this noise. After that, I'll start poking around with the flywheel again. Whatever the case, I hope it's a simple fix. Hate...

That's an excellent idea -- thank you!

I have not; I changed the oil (to Rotella synthetic) shortly after I got the truck, but that's all I've really done.

Thanks -- I pulled the cover to look at the flex plate bolts, but didn't look much further than that. I'll try to dig further. Are cracks generally pretty evident?

Thanks -- I monkeyed with the PS pump last night and re-tightened everything I could find. Still no luck. :(

I should add: I installed a mechanical oil pressure gauge and oil pressure seems to be good...

This one's been driving me nuts, guys. Under load, when accelerating, my M1009 makes a light chirp/knock (really more of a tap -- it's higher-pitched than a knock) . As soon as I let off the pedal, it's gone, and if I accelerate very modestly, it doesn't make noise. I can't replicate it in...