hey guys I have been under my f78 for a day now looking at the vaccum system, the pipe that comes from the engine is sucking and I was under neather it today spraying the wires and I was wiggling them and then it engaged 4wd. it did the same thing when I got stuck and it would go into 4wd as soon as I was on concrete about a metre out the field it engage. can someone please help me . the truck has been though some floods recently would that be the case

cheers

you aint trying till the mud in flying