Tried to recharge AC in ford E-350 gulfstream ultra 1992. R.V. Driving to Arizona in 2 days

I bought a can of R-134a and it had a hose-a pressure dial and connection on it for the low pressure port.
problem is the connector on the hose is to small for the port.
it is a quick disconnect and not like a tire with a valve stem in it-i guess it is the adapter but it is to big for the connection on the hose… Are there different sizes?
do i have the right Freon? Do i need an adapter for the fitting on the A.C. Line. I'm confused. I'm going to Arizona in 2 days so i need A.C.

Ford 7.5 differential problem installing axles?

I switched out the 3.45 open for a 3.73 trac lok and now I can't get the differential center pin out… And yes the locking bolt is out. The pin drops down about 3-4" but then hits the ring gear and won't drop out. Is there something I'm missing?