2002 Ford F-350 • 130,000 miles

One day to another truck does not want to move forward or in reverse when u move the truck either in drive or reverse u put back in park it makes a grinding noise in the transmission what could it be?
November 19, 2012.

That is hard to say as there are many things that could do that. It sounds like the input shaft has a bad gear or the planetary gears are stripped.
Take it to a tranmission shop for diagnosis as a regular repair shop is not equppied to work aon automatic tranmissions. It take a lot of expertise and special tools to work on them. AAMCO is over priced, so use the search engine on this site or the itnernet to find a transmission shop near you.