Transmission mechanic in San Jose, CA.

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Nope it’s not an overdrive...

The only extra part I ordered were the synchros... I wanted those to be new.

I opened up the side cover and saw a lot of rust... I’m sure after tearing into it I’ll have another order of parts...
Okay rust is not good! I always advise getting things apart before making any orders just because places as great as Brewer's is just can't offer the free shipping that places like Summit does. So it's nice to get it all in one order $ wise. You lived and learned on the clutch. You don't want to live and learn on too much! LOL
So the manual was a good choice and what you read it a couple times dive into this thing and open it up. Just be as careful as you can things are going to Clank a little bit to try to do as little as possible. And hopefully someone will chime in on how to possibly hopefully hopefully get those gears cleaned up correctly. I wouldn't go doing anything right quickly to the gears until you get some good info on how to care for them if they're saveable.