Freetranny

With the wheels on the ground, gently rock the car back and forth while applying light pressure to the gear stick to help pop it out of gear.

Gain access to the top of the transmission housing. freetranny

Replace the old transmission fluid, as it likely contains moisture or debris that caused the sticking. With the wheels on the ground, gently rock

Verify the clutch hydraulics are working. If the clutch isn't fully disengaging, the gears will remain under tension and won't move. 3. Mechanical Intervention Verify the clutch hydraulics are working

A transmission usually sticks because the shifter rods, detent balls, or synchro collars have oxidized or settled into a "locked" state.

Before dismantling the unit, try these less invasive methods:

Internal components like the interlock balls or shifter forks are physically stuck. 2. Preliminary Attempts to Free it