1998 Ford Taurus

Transmission problem
1998 Ford Taurus 6 cyl Front Wheel Drive Automatic 169000 miles

My 98 Taurus won't go into overdrive. I replaced the VSS sensor and nothing. I threw the scanner on it and it is throwing the codes VO705 and VO708 what are these codes for? And is this the problem with my car not going into overdrive?
October 12, 2008.

Need to scan TCM for codes
the codes you have is a tranny issue and need to be checked no specific massage with them codes

need manual CHECK IT @

Oct 12, 2008.