shifting problems

Things to check:
1) the clutch is not adjusted correctly and depressed fully when shifting
2) bent clutch disc/pressure plate issues
3) pilot bushing is dragging on the input shaft
4) Input shaft bottoming in crank. ( Have heard of this on automatic cranks that were not drilled deep enough)
5) incorrect Z bar or Z bar alignment
6) All shift rods set up to correct length in the neutral position on the shifter.
What fluid are you running in the 833? Many folks are saying Pennzoil Synchro fluid is great. Some like 80w-90, some still run the ATF.
Keep us posted on what you find for your fix!