It only happens in first gear, after the clutch is fully engaged. The truck shakes like something is skipping. I've already done the following in chasing it down:
- New U-joints
- New Engine mounts (OEM)
- New Transmission mount (OEM)
- New Clutch kit (ASIN)
- New rear brakes
- New front brakes
- Rebuilt OE fuel injectors
I don't know what else is left to check. I do notice that when I push in the clutch sometimes there is a very subtle thunk. It's intermittent tho, but the shaking in first gear is consistent.

Any help would be greatly appreciated. I've searched and search and haven't be able to find anything about this.