Transmission problems only sometimes
 

Every once in a while my 99 Dakota will rev really high when switching gears and once didn't switch at all and then when I take my foot off of the gas and just coast it will make a grinding noise under the car... But when I stop and restart the car it works perfectly again. Then it'll do it again like a few days later. Thanks in advance

I will move this to the 2nd generation Dakota sub-forum.