I can't seem to shift in forth gear. Can't find it & the original shift stick has been replced. Is 4th gear all the up to the right or doow on the right? Please help

sounds like the shifter plate has moved or the alignment on the gear lever mechanism is out of line or even the gear stick plate linc is out of line. how much wobble is in the gear stick when you put into gear. if you can put in gear and move it far left or right then its not working right.

forth gear is not a gear as such but a straight coupling of the input and out put shafts
check the gear shift lever for obstructions at the turret or under the mat
Check the drain plug magnet for metal
,3rd and 4th forth use the same selector rail and if there is a problem with the 4th selector fork there would be no chance of selection any other gear as it would lock the box
it is possible that the syncro ring assembly has failed preventing the movement of the dog to engage the teeth in which case it is box out for repair

has the shifter linkage broken?

the M/t box has 4th
no a/t here as 4th period
so must be manual transmission
real photo blow is A/t BOX.
START A POST MY CAR IS STICK SHIFT
AND WIN.

You should look for the clips and rubber bushing at end of the cables, at shift lever and at the transmission. Buy a repair kit and replace them. That will take care of the problem. Good luck.

it could be the valve body sticking, or worn clutch plates in the 3 & 4th gear planetary drum, or 3rd &4th gear solenoid is bad

Depends on the throttle position, there is a adjustment for that transmission. I would suggest someone who has Honda experience, like a dealer.

4th clutch hub splines are stripped off. GM didn't harden the splines until 2004 or so so the early model gradually wear to the point where they are so thin they strip off - and then, no 4th gear

syncro problem
low on oil
check stick shift adjustments
shift stick bushes or a cable problem
check engine mounts
gearbox, fork or clutch worn