Have the forklift facing up a hill (my driveway) and I can give the engine plenty of RPM. It moves up a little (6 inches) before it can't go any further. The engine is under load but does not stall so I think that confirms that the transmission is slipping. I am not sure if there are some models of this truck that were installed without inch mode but I tried to see if I got any better performance if I just barely let off the break (which activates the transmission). I did not see any difference. Maybe it is slipping before that could do any good.

I checked fluids and the dip stick seems to that this is full (inserted fully in) so it is not fluid level but as I mentioned, I think the wrong fluid was used. I will give Joseph Industries a call this week and see what they say. I am not sure if this is the behavior of a transmission that is worn out. It could be. I purchased this to fix up and use but am only now finding this issue and have no way to know if the transmission was good before I started.