Could be a pump problem or broken planetary. Regardless, the transmission will need to be disassembled.
A Chevy 305 is not a transmission it is a motor. If you mean a Chevy turbo 350 then the answer would be 3 different forward speeds and reverse.
turbo 350 or 700r4 turbo 350 or 700r4
The typical turbo 350 has three speeds forward and one reverse.
4l80e
Turbo Hydra-Matic 700.
That should be the 400 turbo.
turbo 350
Yes, as long as it has the Chevy bolt pattern.
one of the valves in the valve body may be stuck
350 turbo automatic
That should be a 4L80E transmission.
If it is an automatic transmission then it will be the 350 turbo that was put in it from the factory.