The other day i was trying to reverse and the reverse suddenly stopped working . The vehicle has 129,000 miles on it and has been properly maintained. The drive works PERFECT, but no reverse. It almost feels as though the reverse is in neutral or something. The RPM`s go up, but the tires don`t move. The first thing i did is fluid change, then cable adjustment, and finally range sensor for transmission. None of the above corrective actions worked. The only bit of information I have is when it went out I gassed it a little hard then almost felt as if I hit something. So I am thinking valve body, solenoid, or possible spring or something. I dont`t think transmission needs to be replaced because it runs too good in drive. As a matter of fact i did a cross country drive from el paso,TX to Aiken, SC a week ago(1700 miles). If anyone can help I would greatly appreciate.