Will not go into first gear when going down the gears

check or have the gear linkages checked as afirst step

Your differential is upside down. Ford model T's had the same problem. It was possible to mount the rear axle upside down which made the car go forward in reverse and backward in forward gears.

From the way you've described it your gear stick linkages maybe on there way out. When changing gear does the car resist getting into gear?

If it's more of a crunching sound then I would try double de clutching, to do this you need to:
change gear as usual but instead of holding down the clutch throughout the gear change hold it down to take the vehicle into neutral then release the clutch then push the clutch down again and change into desired gear.
To change down it's basically the same principal but you push down the clutch to put the vehicle into neutral then push the throttle down just to pitch revs then release the throttle and push the clutch down to change into your desired gear, if it won't go in to gear easily then rather the throttle until it does.

You can go onto youtube and search for double de clutching and I'm sure some results will come up

hope this helps!

sounds like its bulk rings in gear box, they spin the gears ready as u change gear when they wear the gears are not spun enough to select u probably need to over hall gear box , to help u change gear for now double d clutch, whats this as u want to change gear push clutch down move out gear release.. clutch pushdown again put in to gear use this with each gear un need to change what this does is spin gear ready for u as if bulk ring had done it for u if u are good u can just change gear but have to b good for this

It's not a worm gear,just a small gear on the motor and a long
metal gear an the regulator. They are riveted in,if the door panel
cracked or a rivet came loose the gears may have slipped,have to
pull the door panel to see.

Is your gear lever connected to the transmission?

Most likely is a broken accumalator spring.

check the mechanical linkage to the transmission

hi passing gear is actually your transmision drpping down to second gear.if you hit the gas hard.if you hit the gas lightly it will only drop out of overdrive and go into third and not go into passing gear.

try thinner oil in the gear box also bleed the cluch and adjust it this should fix the problem
cheers tricky85