That's about my only strength - I can legato trill between my pinky and index faster than any other combination
Lots of trills with the ring anchored and pinky doing the work will obviously help. Try string skipping exercises where you lead to a new string with the pinky, too - do these slowly and concentrate on exactly where you fret.
I'll upload some exercises in image form later.
Edit: ok, a web page inside a .zip file is attached. Open it in your browser, and enlarge the text. You'll see a few hammer-ons from nowhere in there, and some slides (represented by the '/' ). Use your pinky, obviously - easiest way to make sure you're using it properly is to make sure each finger uses one fret, so four frets are covered. The slides will deal with the position shifts for you. The first note is played with your pinky, so go from there. Everything is in triplets, except for the final note. Notes not associated with a legato symbol are picked.