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The cause of the corrosion is unknown. I bought the car in 2002 and the person(s) who worked on the transmission were complete idiots. They broke all 3 of the transmission mount bolts in the housing and just installed the thing as is. I was driving around like that for years before I fixed it here:
Found the work of some POS mechanic on the transmission today - 3000GT/Stealth International Message Center
Anyway, in the time I have had the car I always used this lube:
AMSOIL - Synthetic Manual Transmission and Transaxle Gear Lube 75W-90 (MTG)
As for the synchros....only 3rd gear has a slight grinding sound to it if you shift fast. If you are slow to release the clutch there is no sound. All other gears work fine. The car has about 280K miles now and I doubt this thing was rebuilt at any point.
I shot a 50 second video but nothing on it is remarkable so it is not worth an upload. But I took some photos of the gears in various positions.
The problem I had was that all of the gears were messed up after the mechanic rebuild. I have done nothing to alter his work so here are the pics. Installed the car is in 1st gear in neutral. It is NOT a shifter cable issue. I tested without cable just moving the linkage by hand and neutral position is 1st gear. Also I had no reverse; reverse was a high forward gear that caused the engine to stall when the clutch was released.
The first 2 pics are of the 1st and 2nd fork in the neutral position.
http://img.photobucket.com/albums/v2...c/DSCN4107.jpg
http://img.photobucket.com/albums/v2...c/DSCN4108.jpg
Next is the 1st gear position
http://img.photobucket.com/albums/v2...c/DSCN4109.jpg
Then 2nd gear
http://img.photobucket.com/albums/v2...c/DSCN4110.jpg
I also took pics of the other fork.
This is 3rd
http://img.photobucket.com/albums/v2...c/DSCN4113.jpg
This is 4th
http://img.photobucket.com/albums/v2...c/DSCN4115.jpg
Of course, I can not take a photo of 5th and reverse since 5th is removed and reverse is not bolted down.
I'm stumped on how neutral = 1st in this thing.
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So even when its all apart it still does the same thing? you should be able to see the gears spinning when you engage them.
Reverse is the first picture you have in your last post.
And after further review of your pictures, none of them are in neutral.
I see that you were demonstrating the gear engaged but show them in neutral as well.
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The Second pic on this page is of the fork for 1st and 2nd in the neutral position.
If it is in neutral and I turn the input shaft by hand should there be zero movement on the differential gear ?
