After spending about an hour searching the forum I could only find one post even remotely close to the issue I'm having and it had no replies so here's hoping someone can help me. My wife and I live in SoCal and it's her LC. Anytime we've visited Lake Arrowhead, (very twisty mountain roads, lots of elevation change), here truck makes a small rattle like sound, something similar to a heat shield vibrating, every time we accelerate up a hill. If it's not uphill it doesn't make the sound. We were up over the weekend so I could use my friends lift to make changing the starter and fuel filter easier. Completed that, along with belts and an oil change, no issue. Only now anytime we accelerate up a hill from standstill, or at speeds below 30mph the noise is there, but is a very loud grind/squealing metal on metal sound. If you let off the gas it goes away completely and doesn't come back if you're easy on the go pedal. If you're at speeds above 30mph, no sound no issue. Drove it the 90 miles back from Lake Arrowhead to home and the only time it made the sound was going up a hill from a dead stop. Searching the forum for similar issues all I could find was trouble with loud grinding during the starting process, which I don't have. To be clear, there is no grinding or strange sound of any kind on startup. It did make the same sound, though not as extreme, when I started it the first time after changing the parts. Crawled under the truck and I'm 99% sure the sound is coming from the flywheel housing, leaving me at a total loss. What could it be? Thanks in advance for the help!