yes, I've searched but can't find exactly what I'm looking for.
What's the width of a 78 hp44? Is a 3/4 and a 1/2 ton the same
width?

http://77cj.littlekeylime.com/web_rs44.html

I see all kind of good info, including axle shaft lengths, but nothing on track
widths.

1/2 is 67-68 3/4 is 69 roughly