I need some troubleshooting for the e-153 tranny, Its really hard to put the gears in. Options

[eggman40]

I used the e-153 tranny with the 3s swap. Ive finally got the engine running a few weeks ago but i took it for a
spin yesterday and i had the hardest time getting the thing into gear. Im using my stock ST shift cables and the

all-trac linkgages. When the car is off, I could shift in and out of every gear with no problem, which leads me to believe that the linkages and cables are doing their job. However when i turn the car on, it is REALLY hard to the

gears into place, sometimes they will grind, or they wont go in at all. Could there be anything wrong with the clutch install? Throwout bearing? i have no idea. Id appriciate any help thank you.