I'm assuming you know the difference between the evdo and evdo rev A icons on the Transform. It doesn't have a 3G icon like the HTC Evo.
Might be a weather related issue. I live 45 miles north of NYC in a 3G (evdo rev A) area but starting today, I started getting the evdo icon only, too. However, my speeds using the Speedtest.net app average around 650kbps down 500kbps up. That's right on the lower end of rev A speeds. When the 3G network was working in my area, however, I was only getting around 800-900kbps.