Hi I have a 1991 4trak 2.8 td and it's great. The other week the 4 wheel drive stopped working. The light on the dashboard doesn't come on and 4 wheel drive won't engage. Mine is the type where I just lock the hubs and then press a button on the dash to engage. I've been told that there is a solonoid on the gearbox and that it's probably stopped working. Replacement is around Ã‚Â£60. There is one solonoid to engage and one to disengage. Can they be taken off and cleaned up or something? I don't use 4wd much but I like to know it's there if i need it.