Ok, so my '75 has been running really well for the past year or so. Fouls the plugs every now and then, but normally that only happens if I get lazy and run the cheapo gas. However, this past month, the truck has started to develop a strange scrapeing sound. Symptoms: Started with a barely audible light scratching noise while at idle in Drive. Put it into park or reverse, and the noise would stop. Drive, L2, L1 and Neutral all had the scrape. Checked the engine, tranny, and Tcase oil, all in good condition. The noise has now progressed to being in all gears, so I'm fairly certain it's not the transfer case. I only hear it in the morning, when I fire up the truck for the first time. By the time the truck is warmed up, the sound stops. It definately sounds like it is coming from the transmission/engine area, but that is just by listening in the cab and under the truck. No lack of power, no noticeable jumps in the tranny when it shifts, and no shimmy from anything seeming to be out of balance. Truck Details: 1975 K5 350, 4bbl carb TH350 Tranny, NP203 Dana 44 front, 14 bolt corp. rear, Warn Hubs, 33's, stock open diffs front and rear (yech, got to fix that at some point) So, does anyone have any ideas? The motor and tranny and tcase are all stock original, so they have 250K miles on them so far. Getting pretty old, but if I can get an idea of where to look, maybe I can replace some parts, instead of the entire units.