What causes my 1999 dodge ram 1500 5.9 transmission shifting problems?

SOURCE: 1999 Dodge Ram 1500 2WD won't shift properly

Sounds like the speed sensor on the rear axle.

SOURCE: transmission does not always shift into overdrive

Governor pressure sensor or solenoid is going bad. To replace them drop the tranny pan, remove the filter , and the parts are pretty ez to get to. These aren't cheep thou, but replace them as a set. Parts will probly run about $200.

SOURCE: I need to replace the transmission speed sensor

usually they are at the back of the tranny with a 2 wire plugin and one bolt holding it in...if not it may be part of your rear ABS sensor in your rear end...do you have any codes about ABS

SOURCE: Dont know what kind of Transmission my dodge has

ON THE BOTTOM OF THE TRANY THERE IS A TAB ON THE SIDE OF THE TRANY ON THE BOTTOM LIP WHERE THE FILTER PAN IS BOLTED THE NUMBERS ARE STAMPED ON THE TRANY HOUSING ON THE BOTTOM NEXT TO THE PAN

SOURCE: My 97 Dodge Ram 1500 5.2L Pickup has started

if the truck feels like,
the more gas you give it the slower it goes,
you might want to check for a converter plugging up.