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Clunk in drivetrain...


dvdswan

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So the 02 Explorer with auto 4WD has a slight clunk in the drivetrain. I've only noticed it at slow speeds 25 and lower, it kind of sounds like the drive line is catching up with itself and the clunk would be in the t/case or if shifted your t/case in low and then the trans in drive and the gears are aligning themselves.

It has 132,000 on the clock and I'm wonder if the t/case needs a fluid change. I'm used to the old fashion manual t/case so I'm not sure.

The clunk has occurred 3 or 4 times on a straight road, not frequent, today it was audible enough to make wonder why. I can't see this as a normal thing but curious as to why it would think it needs to adjust slack in the driveline.
 


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franklin2

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If you are giving the engine throttle and then letting off, some clunk is normal with that many miles. It's usually in the rearend and a little in the splines and the rest of the driveline.

If it's going clunk clunk clunk and you are steady on the pedal, then you might have a u-joint going out. Best thing to do is chock the rear wheels so it will not roll, and then with the engine off, take it out of park and put it in neutral to take any strain off the rear shaft, and crawl under there and pull and twist the driveshaft and see if there is in play in the u-joints. Some play is expected in the rearend and some in the front transfer case/transmission.
 

dvdswan

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Ranger XLT 2WD
Engine Type
3.0 V6
Transmission
Automatic
2WD / 4WD
2WD
My credo
Keep your mind like an umbrella, it only works if its open... Continually learning.
I'll check those things but I'm more apt to think is somehow slack between the front and rear drivelines. This is very intermittent which is why I'm puzzled worried. I understand the tolerances add up in the drivetrain for clunks, each one adds up.

Would it be possible for the "auto 4x4" to be trying to activate itself on normal dry street driving?
 

franklin2

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I would get under there and check for anything obvious first.
 


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