<VV> Greenbrier 64 differential

[D. Monasterio]

     My 64 Greenbrier has a 64 car type diff. case stamped HS 09 17. When I bought it I tought it was the original one but, according to Bob Helts' (The Classic Corvair, page 203) all 61-65 FCs used the 60-63 diff. case.
     Did some 64 FCs come with the 64 car type diff. or... mine was changed ?

     Daniel Monasterio (sanding,sanding... sanding. I hate this task)