I have a tremec T5 gearbox for a BA falcon.
As you can see from the photos the syncros and gears are in very good condition.
Only problem is the 5th gear syncro retainer is broken.
Paid $1300 selling for $600 ONO

 

 

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File comment: this is the 5th gear syncro retainer that is broken matt 008.JPG [ 95.75 KiB | Viewed 113 times ]

matt 009.JPG [ 159.75 KiB | Viewed 116 times ]

matt 003.JPG [ 175.94 KiB | Viewed 104 times ]

The tab has broken off the reverse brake cone - would've experienced some clashing when engaging reverse gear. Won't affect 5th gear, it does use a synchro ring the same as 5th (just out of the photo).
Be better to replace it - it's only held on with a circlip with a spacer.
Would help your sale I would think.