MINE JUST DID THAT THE OTHER DAY!!!! After a day of offroading... i have an automatic and it would shift fine from 1st to 2nd.. but wouldnt shift out of 2nd gear it would just revv wayyyy up and would not shift. I figured it was an electrical problem.. took off the fuse panel lid and blew all the **** out from in my fuse panel. Not sure if this is what fixed it, but honestly just before the tow truck came i was liek **** it ill drive it one more time see if it fixed itself, and sure enough it did...
not sure if thats what it was but give it a shot?
DOUBLE LIFTED and PREKEYD, 17x9 Eagle Alloy 197's, 35x12.5 Hankook Dynapro's, black headlights, 3" flowmaster exhaust, UD Pulley, K&N, JBA Headers, Motive 4.56 gears, Superchips Flashpaq Performance tuned, FOX shocks, Pioneer sound and much more.