Plastic Chunks

[TB14]

A buddy of mine was running his 2000 Cummins manual while towing a trailer. While in 5th gear truck kicked out from 5 th and will not engage in any gear now. All gears feel neutral. We can walk through 1st 2nd 3rd 4th 5th but cant get her to grab. Also tried in 4 high and 4 low and nothing. Also popped Transmission inspection plate and found plastic chunks. Anyone have any ideas?

 

[ouch1011]

The ends of the shift selector forks have plastic on them where they interface with the selector collars. There may also be plastic bushings on the shift rails. When you move the shifter, does it seem like you are actually shifting things inside the transmission, or does it just seem to float through each position without doing anything?

 

[TB14]

Shifting through gears but imput shaft was not moving at all. input shaft was not spinning at all and the front gear that is connected to the input shaft was moving up and down