so here's the deal...problem I'm having, I bought this 2010 f150 from the company I work for, front diff was shot, front drive shaft was in the bed, that's all I knew about the truck so I bought a complete front diff from a used place, it only has 58000km on it, good diff... So I installed the diff and the old front drive shaft, which doesn't seem to be in the best condition, now when 4 wheel drive is engaged I'm getting a constant clunk/binding noise from the front driveshaft area,,,, any ideas on where to start looking,thanks again