Transmission issues? Car won't go into gear even if the engine is turned off
 

I was driving last week while trying to shift into another gear, and I heard a pretty bad grind noise and right after that I was unable to shift into any other gear, it was stuck in neutral.

I've taken it to Nissan, where they advised my I should replace the transmission all together. (3k) 2k for new trans and 1k for labor

I've also taken it to Aamco where they said I should have it taken appart and have the parts replaced. My only concern is if I needed a new transmission it would be the labor + a new transmission for this (2k for all labor)

1. I have a 6 speed manual without rev limiter
2. I had oil, so thats not the problem
3. I had a new clutch installed 15k miles ago.
4. I have 65k total miles

Anybody know what I should do, or if I should take it to another shop?

Have you always brought your car to a dealer for service? You can ask them for some goodwill warranty for the transmission. Maybe they can help you cut the bill in half or something. You are only 5K out of the powertrain warranty. Just a thought.

Dude just buy a new 88 OS Giken transmission and drop it in, i know i would if myne went. And if u could just unbolt about 15 screws and install it ur self u can save 1k wich is a hella $ to swap trannies if u ask me $400 tops i would give for 30 min job 2 guys.