High RPMS at 55 MPH

CONVERTER IS SLIPPING!....gonna burn up the trans pretty quickly! put in some 4:56 gears or a stock converter back in..

I dont "feel" or "see" it slipping. The rpm's hold steady while driving....
You think a stock converter would be fine?? The reason we went with the one currently in it was because it was to our knowledge new, or very few easy miles on it and we were unsure of how many miles, or how "tired" the factory converter was.
Here is a link to the cam we put in

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=665&sb=2