I have a 2003 Kubota 3130 GST 4X4 tractor with loader. My tractor is currently at the dealer and they seem to be having troubles diagnosing the problem. Right now the unit is responding in different speeds than what is actually been selected with the GST shift lever. As an example if i gear up and shift into the 7th forward gear it reacts sometimes as if it is in high gear (12th) and respond up to 15mph which is top end for this tractor. The other instance occurred as i shuttled bewtween forward and reverse with a full bucket in 1st gear. The tractor moved forward at a much faster pace (more like 4th or 5th gear. This could be extremely dangerous obviously. I was able to replecate this event yesterday at the dealer but they are kind of stumped. They recently changed the electronic switch on the GST lever but don't beleive it has anything to do with current problem. I'm not convinced. See my post yesterday "need a gst expert"