65 GS 4 speed listed as a vette transmission??

[GranSportSedan]

Not mine

https://portland.craigslist.org/clc/pts/6001017605.html

**1965 Corvette Super T10 Borg Warner 4 Spd. Transmission Close Ratio Hi Nickle 1st Design** $1000.00 OBO
10/27 Spline
Main Case T10-1B Date Code WB1853
Side Case Date Code 1-5-62
Tail Housing T10k-7 Date Code 12-17-64
Date Code: W- Warner Gear
B - February
1 - 18th
8
5 -1965
3- 3rd Shift
Ratio 1-2.20-1
2-1.64-1
3-1.31-1
4-1.00-1
R-2.26-1

[WkillGS]

Maybe it came from a Corvette Grand Sport?

But yes, it looks like a '65 Buick GS trans.... correct case, 3 grooves on input shaft and 'GS' on tail housing. Only the side cover is wrong.
The Hurst shifter and Centerforce pressureplate/clutch make the $1250 package price a decent deal.

[GS66]

That does seem like a fair deal especially if the trans is in nice shape.

[Buick_65]

If it had a better 1st gear I'd jump on it.