Getrag 360 noise

[acemontages]

input shaft is fucked

[mkinser1026]

Your shifter boot is on backwards

[chaplaintoo]

Might be the input shaft flopping around in a shot carrier bushing in the flywheel.

[Filmaker92]

I don't know anything about cars. But it seems to me that something broke off and it's being hit on the surface within the gear. Then when it hits the 4th shift it's being lifted as it's not being hit on the surface.