JD730

I went to look at a 1985 International truck last night. 3208 cat with either a 6 or a 7 speed. Single speed rear, has a HIAB boom on it with a flat bed.

The trans is big, for a medium duty truck, looks like 3 shafts in the trans. I believe it would be called a twin countershaft trans. I need some possibilities of what it could be, because there is no shift pattern to be found in the cab.

Thanks