I have a fourtrack 2.8td 1989 which I have had since august 04. All has been well untill 1 day when I was towing my horse trailer out of a very muddy field, when the four-wheel drive decided not to work (not the best time to not work). I had to get a tractor to get me out, very embarasing as I am always going on about my tank being a great tow vehicle. Its still not working and wondering if anyone knows what the problem maybe? It drives like its in 4wd i.e slowly but the light does not come on on the dash and the front tyres spin. (not good i think) Had someone look at it and they think it could b a sensor prob on the gearbox but not sure.