Hopefully you're not having to mix diff. fluids because it's low...just replacing old I would assume
Switching to AMSOIL or synthetics in general is fine.
As for the trans fluid, if you're needing to change the filter, aren't you changing the fluid as well? Mixing with AMSOIL's TorqueDrive is ok, but not recommended. If changing fluid types, draining and replacing with new would be preferred.
FRAM??? Donaldson is another reputable brand or OEM.
Heath