I purchased my Patrol GR 3.0 new in 2003 when I was living in Devon, UK. I immigrated to the Turks & Caicos Islands in 2008 and took the Patrol with me. I cannot find a workshop manual in the UK and the Haynes manual I have says little or nothing about the auto. It has 39,000 miles on the clock. The car has performed well until recently when I noticed the engine back off the throttle momentarily when traveling over an uneven road. This was odd because it has been travelling the same roads for the last six years without this happening. More recently it has started to twitch when approaching 52 MPH which is where final drive lockup seems to kick in. Intermittently it cannot make up its mind whether it should be locked in or not and this is more noticeable when cruising without acceleration. If this occurs it can be almost eliminated/eliminated by giving it more throttle. When towing trailers it can demonstrate similar traits in third, again when cruising/coasting. The ATF looks clean in fact almost clear and this is Nissan original ATF, the level is slightly high but it has been that way for 11 years. I think its time for an ATF change which I understand should be Dextron III? Is there a filter to change out or a screen to clean? I assume that I will need a new tranny sump gasket? With an oil cooler and no equipment to flush or purge the cooler can I change the ATF a couple of times to effect a clean up. Are there any tricks to flushing the system without the right gear. Please remember I live on a Caribbean Island where so called mechanics have a 2 lb hammer and it will fit, so DIY is the better way to go! I understand the auto tranny has a separate ECU but aside of Haynes mentioning it, it does not even tell you where it is located. Are there any sensors or solenoids connections that I should be checking? Am I looking in the wrong place could this be something to do with the engine management? Any help pointers would be greatly appreciated. Any suggestions on a manual and where to locate it?