i have a 2000 f250 with the 7.3. tonight i went to pull two of my buddies out of the mud/snow. after i had hooked up to him i engaged the 4-wheel drive. as i was pulling him out they thought i was in 2- wheel drive because i was spinning and they said that only the rear tires were moving. i disengaged everything and then re-ingaged and it was still doing the same thing. i was still able to get them out but know i am wondering what is wrong the 4-wheel drive. it doesn't make any grinding noises or anything when it engages and the lights on the dash come on so i thought it was working. any help on where to start would be great. thanks.
