1978 Chevrolet K10 350/SM465/NP205. I’m going to start with saying this truck is my work truck and it has a utility bed on it mostly full of all my tools. The truck had an issue a while back where you literally could not take off in first it would shake so bad similar to a wheel hop feeling, so I started using low to take off. After a few weeks I couldn’t take off in low either. Replaced motor mounts(cooked lol) it’s somewhat better, I can take off in first if it’s perfectly level or down hill, but if there’s any resistance taking off it still shudders. Could this be some other mount somewhere? The transfer case looks solid nothing appears loose. Could this be in my clutch? There’s a loud obnoxious squealing noise while the pedal is pressed. I’m not positive where the engagement of the pedal needs to be since this is my only mechanical clutch truck(other is hydraulic) I currently have it adjusted to as close to the floor as possible since I prefer it to start moving when I start letting off(probably a good 2” off floor before it grabs) but it does grab almost all at once, there is nothing smooth about taking off in this truck. Will provide photos of anything requested.