1996 5.9 magnum shaking

[ChrisM_59]

i have a 1996 1500 with the 5.9 magnum and a 46re. after about 5-10 minutes of driving, the truck will shake anytime i get on the gas and i drop speed. its only happened twice because i refuse to drive it until i figure it out so i have no real video of it. the best way i can explain it is i loose all power and anytime i try to accelerate, the entire truck will shake. i talked to a couple people who have an understanding of transmissions and they said it wasnt a transmission issue. however, when i dropped the pan, it was covered in whatever is in the picture. its not chunky, almost like magnetic clutch material.

 

[Daw14]

Apparently the people who you spoke with do not have as much of an understanding as claimed.
Start searching for a transmission shop that has been around since the 1980s.
They might have some older experienced employees who can handle a rebuild on it.
Yes that does look like clutch material and some other material also.
A rebuild and new converter are needed.
I would run new cooler lines to the new transmission cooler that gets installed with the fresh transmission.