Car won't go forward or back words?

2005 ford torous auto was driving on freeway and started to rev but slow down no warning sign that tranny was going bad and shifter slides right between all the gears

You say "no warning sign that tranny was going bad" so do we assume that your car has not been leaking transmission fluid?

If not, and the fluid level is where it should be on the transmission fluid dipstick, and still has a "fluid" feel to it] then the clutch bands that grip various gears may have worn to the extent that now they don't have the force to grip down tightly enough to engage the automatic gears.

Usually, though, you would notice an increasingly protracted gear change in the weeks prior to it happening, in which case there should have been warning signs, I would have thought.

Fluid looks fine i was litarly driving and the revs went up and i slowed down no clunk no sound no warning nothing

Ford Taurus and the transmission is gone a common problem with Taurus. Find local shop at ATRA.COM for more help. It will be in the 2300 dollar range to rebuild it