Is there any tranny from another vehicle that can go on mine? Also is it posible I cud put a 5 speed in mine?

Depending on what motor you have there are some Honda motors that would work. It is best to keep the same configuration that you hacve as swapping out for sifferent motors is a lot of extra work.

It is kind of the same thing. You will need a different computer, crossmember, mounts, a bellhousing that will mate the engine to the transmission correctly, a shifter that will fit the floor tunnel and be able to move where it needs to, will the master cylinder match hydraulically with the slave cylinder and possibly a few other things. If your truck was never offered with a 5 speed there may not be enough room for it.
A Honda or Isuzu Enthusiast forum is the best place to find this kind of swap information.