Need help identifying industrial 727

The 10,000 day calendar date on that case is 3227 which is May 29, 1970.

When you take it apart look at the bushing inside the front clutch drum. Narrow is 62-70, wide is 71 and up.

Yes that looks like an A100 tailhousing.

It's not. The A van tail shaft has an eyelet for a bushing.

A100 TRANSMISSION.jpg