Cast Iron 4 Sp. Hydro-Matic

[jbgroby]

I had responded to a posting last week and another posted made a comment on the type of transmission I have for the truck. I only knew it was a hydramatic, but he said is was a "cast iron hydramatic and the're so rare, it's almost a rumor".

Are these type of trans. rare? It works perfect and I know it was considered the high end optional trans for the 160 GMC, so I suppose it was a good one. The shift patterns still gets a few folks looking at it as it is as follows

N-1-2, 1-3, 1-2, R.

I understand that a few yound men dropped it in low and shot backwards into the car or walls?