“GS” tailshaft questions

[BuickGS65]

The “GS” manual trans tailshaft - besides “GS” what other casting numbers/letters should the tailshaft have?

Is this a cast iron or aluminum piece?

Did any other cars besides 65/66 Gran Sports have “GS” cast in the tail shaft?

Thanks!

[TrunkMonkey]

It's aluminum tailshaft.

GS is on the shift gate pad between the bolt holes, drivers's side.
The date code is on the passenger side. MM-DD-YY raised numbers on a cast rectangle pad. (mine was 12-21-64)
on the top is ;

 T10K-7
WG DIV

That is what was on mine.

Hope that helps