recently had the clutch replaced in my 79 k30 350/sm465/np205. The wrong size throw out bearing had been used and destroyed the clutch n the front snout of the trans. All was fixed. Drove fine the first 50 miles or so then the vibration started growing. Drove it another 50miles back to my mechanic. The vibration is a lot worse at higher rpm. It feels like ur running over the rhythms on the side of the highway. Like a hard pulsing vibration can be felt in the steering wheel and especially the clutch pedal. No noticeable vibration from trans shifter or tcase shifter. Truck shifts great. It's like it right between my feet or right behind the engine. I took it the mechanic immediately thinking there was a problem with the new clutch n didn't want to ruin it. Been at the mechanics a month now he's tried everything he can think of but the vibration is still there. I told him it never did this type of vibration before the clutch work. He's having a trans tcase specialist come look at the truck. I feel like it's clutch related n I'm about out of patience. Spent the last month haulin firewood in my daily driver instead of the work truck. He's an old family friend n wouldn't do me wrong but shit happens. U guys have any ideas as to the problem ?