Hello, i had picked up a good working 4 speed 6ish years ago and finally have everything set up and the engine is running, however The transmission won’t shift into any forward gears, it goes into reverse easy, I removed the shifter linkage put the pin in to line it up checked it against the transmission arms and they are all lined up correctly. The arms on the trans separate of the shifter can’t be moved on their own except the reverse shift arm. Anyone have an idea on what could be the issue?

Thanks
Ryan