I have a 2001 Ranger that's having some issues. First of all I have a leak from my front driveshaft. I believe that could be a pinion seal. Second, my four wheel drive is noisy. It rattles when engaged and taking off after a stop it acts like it's not fully engaged because it seems to pop in with a noisy crack. Then, when I turn the switch back to 2 wheel drive, it doesn't want to disengage. What's going on here. Any help would be greatly appreciated. Thanks.