Freebies are always good.
When you put it together, put grease on everything that moves.
But, make sure that the shifter rod is very well greased. You might want to use Nevr-Seize.
This is the rod that the shifter handle goes on.
Also, the sliding part of the dog clutch where it slides on the main shaft.
This is a common point of trouble. The winch does not get shifted all that often, and the shifter can stick.
If you cannot put it in gear, you can't use it.
I like to leave my winch out of gear just in case. But, during hunting season I often leave it in gear so that I don't have to shift it and its ready when I need it.
If its a long pull, I can take it out of gear and pull the cable to where I need it. But if its a short pull, I can just put the drive in reverse and let it pay the cable out until it reaches.
If you look at the dog clutches, you will see that they have a slight negative taper. In other words, if you put the two halves together about half way and twist, they will tend to move closer together.
This keeps the winch engaged under load. The harder the pull, the tighter the clutch halves go together.
I have never seen it, because the dogs are very thick, and there is not much movement, but supposedly the clutch can wear until you get a positive taper and the clutch will walk out of gear under load.
BTW, the best way to engage the clutch, is to start the drive moving, grab the shifter handle and put a constant pressure in the engage direction.
When the dogs line up, it will slip into gear.
I have more trouble with helpers doing that. They will start snatching on the shifter trying to get it to shift.
And invariably they will miss the one point it lines up.
I keep telling them, just hold hard steady pressure.