So my trucks been doing something weird. When accelerating around 45-55 mph, a couple seconds after it shifts to 3rd, it does a weird type
Of shake/shudder. Feels like I hit a small bump in the road. Also when coming out of a cruise to accelerate, it will Make a very violent clunk and then speed up. I'm thinking it's a problem with my torque converter but my mechanic says transmission and my buddy says rear end lol. I dropped the pan and there was some shavings but nothing huge and it was the first time it was ever dropped. After 90k miles. Anybody got any theories? Any help greatly appreciated

 

Them can all be a cause

 

Ya I figured I just don't wanna start fixing random crap until I figure it out, that can get pretty pricey just hoping someone here might have had a similar issue