Transmission rebuilder

[Al NJ]

My nephew has a ‘48 Ford F-1 with a Flathead 6 and a 4 speed.
The transmission is in serious need of a rebuild, or so I suspect. When I drove it you could barely get it to shift into 3rd, (from 2nd). When at a stand still and idling you can barely get it into 2nd to start off. (1st gear is a granny gear)
I tried double clutching, doesn’t seem to matter if you do or not. (I’m only familiar with my ‘33 wagon, which I don’t have to double clutch in and my son’s Model A, which I do have to double clutch)
I’m half wondering if it has gear lube in it, or the correct lube.
It’s about 100 miles away from where I live so I can’t run out and check it.
My nephew isn’t real “handy”.
So my question is, provided it does need to be rebuilt, does anybody know of anyone in the Ocean County, NJ area that would remove, rebuild and re-install the trans. Or possibly put a 3 speed in it as a friend of mine told me that might be a better solution.
I have enough projects of my own so I only want to “consult” on this, lol, or maybe check the gear lube in the trans the next time I’m where the truck is.
Thanks.