My 1991 Subaru Legacy won't go into gear

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sounds like your linkage may have disengaged and the trans is stuck in neutral. You need to get under car and check trans linkage.

it sounds like clutch is not desingauging is the hyd slave cylinder full and did you bleed it

try a bad thrust bearing or stuffed pressure plate

Sounds like the clutches for 3rd Gear are worn out. Need to rebuild or replace the transmission.

try bleeding the hydraulic clutch, if still not disengaging a new clutch cyl is needed or a rebuild kit can be used..use dot3 fluid

Maybe the Clutch Linkage?? not really sure tho

check your transmission fluid with the engine running and gear in park. check the level, color, smell, and feel it. adjust level if needed, if it's black, smells burnt, or you feel small metal like shavings, your tranny is junk.

Interesting problem. The gear shift is run by levers and rods, not cables. I suspect that there are problems with
a) the rear gearbox mount (e.g. broken); or.and
b) engine mounts (broken or loose)

that allows the engine/trans to move fwd/back, and this is affecting the gear shift linkage.

You should also check the clutch pedal freeplay.

I doubt there is ANY problem with the standard transmission.

Check the clutch fluid (brake fluid) should be a small resivoir on firewall to fill..I believe these are hydrolic clutch system,and not cableoperated...may be a small seep im master clutch cylinder,or slave cylinder(on trans)needs to be bled,somewhat like brake system...Lee