A833 trans alignment issue? Help

A tight/ damaged pilot bushing/ shaft can most CERTAINLY cause this, and in fact there was a member on here who recently experienced this.

A misaligned/ tight pilot will "try" (and does) grab the input shaft and keep it turning.

Are you saying he installed the pilot bushing incorrectly because the problem didn't exist until after he replaced the clutch/pressure plate and bushing? Bushing cocked? Grease on input shaft/bushing? Again... just trying to help.