Ok, so there must be something else going on. I noticed that if it changes to 4th between 60 - 70 km then it tend to surge. But not as much since I have changed the fluid. ( need to change it again anyway as I put the RTK2 filter in instead of the RTK4. So that is slated for Monday morning.) If I stick the boot in to it, it seems to change as normal, for example merging on to the Motorway. Probably more noticeable driving up a steep incline. It is only the 3-4 gear change. Other gear changes seem normal. Is it the Torque converter? or something else to do with letting the transmission know the output of the engine? It is idling a bit rough. So maybe something there? When I look at Envyous software AED (Advanced Engine Diagnostics) nothing, from a layman point of view, stands out. I can post screen captures if someone wants to look at something specific. What book do I need to buy/find to understand the different parameters from the AED software? For example the Parameter: 3-4 Adaptive pressure = 32 psi I would guess that it should be higher if the torque converter was faulty???? Or am I completely off the track?