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Ranger 4WD problem Grant 1-4-12  
I have a 2005 Ranger 4WD 4.0l V6. In low range there is a very loud knocking when i load it, eg: reversing a boat up an incline. I have opened the transfer case, all good, cv's all good. Any help would be appreciated,it sounds mechanical to me, but does anyone have a current flow diagram for this vehicle? is it possible the switch is faulty or possibly a vacuum problem on the front diff? please help, this problem is driving me nuts!!!!
Re: Ranger 4WD problem Phil Feinstein 1-4-12  
The first thing to check is the U-joints: there should be no visible play in the joints in ANY direction. If you find a joint that has play (especially if you can wiggle it visibly), replace the u-joint.

There's a problem that I've seen in 2WD trucks and vans if the u-joint by the tail housing goes bad. The slip joint moves around and wears the tail housing out of round. It creates a hell of a knocking noise, but typically at speed rather than under load. To check, move the driveshaft up and down and side to side where the driveshaft goes into the tail housing. I don't remember if your year truck has a slip joint for the rear driveshaft coming out of the transfer case. If it doesn't, you don't have to worry. If it does, you really need to check it, especially if you find a bad u-joint at that point in the driveshaft.

Something to be aware of: the Ranger uses a 3-piece driveshaft for the rear. If the support bearing in the middle goes bad or if the strap gets bent it will make an amazingly loud knocking noise any time the truck moves, at any speed under load or not.

Hope that helps!
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