Why my jeep grand Cherokee don't want to reverse? on 2003 Jeep Grand Cherokee

When I put It in reverse it doesn't move. But when I put it in drive it go but stay in first gear. What is the proble?

Asked by for the 2003 Jeep Grand Cherokee
With shifter in LOW OR FIRST GEAR, drive it up to 20 mph, let off gas and see if the emgine will hold it back or what is called engine braking! If NOT and just freewheels, it's "internal" damage and trans will need to come out for repair!
2 more answers
agree with #1 but do not let them repair until you get 2nd quote
Take it to AAMCO for a free diag and estimate, then post that we might give a second opinion.