Trasco gearing set-up?

[oliverchris]

I have what I think is a Trasco unit on an OC3-60. It also has a 3PH.

My question is were all Trascos set up the same? Unless I have bad gears, I seem to get only two positions - front and back.
Could this one be set up as a reverser? Were there different configurations?

The model A type aux. I have on my HG has 3F and 1R.

If I have trouble, how would I check quickly? Does that top cover come off nicely, or do I have to get the UV assembly out and really get into it?
Machine has been sitting in a barn for many years.
Will post a pic soon...