hi everyone, Thanks in advance for reading and the help. Just picked up an '83 F250, 6.9 IDI 4-speed manual, 38k miles. Today I noticed that the truck shaking when transitioning from clutch to gas in first gear from a dead stop. Doesn't shake once the clutch is fully disengaged in first, and doesn't shake when shifting through any other gears- only shakes while shifting into first from a dead stop. The shaking is at the engine, I don't feel it in the stick. It got worse throughout the day, and I never noticed it prior to today. I was making a few trips to the landscape supply store today and noticed the shaking was a bit worse when the truck was loaded. I a yard of rock in the bed of the truck this morning, and parked it on a mild slope in 2nd gear to keep it from rolling for about 30 minutes- The e-brake is frozen right now. I can't imagine that would have anything to do with it but the problem seemed to start not long after that. Any ideas would be appreciated!