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Old 03-09-2014, 01:48 PM
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Default noise in 4 wheel drive

Hello all. I am experiencing a noise when I put my '77 FJ40 in 4 wheel high. When I get above 20 MPH, I hear a bad clicking noise. When I let off the gas, it gets louder. Could this be either hubs, U-Joints, bearings? Ay helpful info is appreciated. Just not sure where to start.
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Old 03-09-2014, 04:49 PM
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Yes to all & possible a misaligned driveshaft
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Old 03-09-2014, 05:12 PM
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my friend is a mechanic and put a new clutch in it for me could he have done something wrong to cause this .
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Old 03-09-2014, 06:03 PM
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He may have separated the driveshaft when he pulled your tranny for the clutch replacement. If it's misaligned it'll vibrate like crazy above 20mph. Easy fix & there is a term for it but I can't think of it right now.
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Old 03-09-2014, 06:06 PM
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http://forum.ih8mud.com/40-55-series...ibrations.html
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Old 03-09-2014, 06:39 PM
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thank you sir well appreciated.
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Old 03-09-2014, 07:56 PM
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Default noise in 4 wheel drive

NP, hope you get to the bottom of it. I'd look at your front driveshaft first if it only happens with 4wd engaged. Wouldn't hurt to lube all the u-joints & driveshafts, especially if you find one misaligned.
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Old 03-09-2014, 11:03 PM
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The term is "out of phase", if you were wondering. It has to do with the fact that universal joints do not conserve angular velocity, and so a special set of conditions must be satisfied for them not to vibrate when spinning. One of the those conditions is the phase of the joints, or the position relative to one another.

Glad Travis was able to help. I think he hit the nail on the head with a good first diagnosis. That would be my guess as well.
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Old 03-10-2014, 12:05 AM
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Quote:
Originally Posted by axleike View Post
One Of The Those Conditions Is The Phase Of The Joints, Or The Position Relative To One Another I Think He Hit The Nail On The Head With A Good First Diagnosis. That Would Be My Guess As Well.
X3

Also worn U-joint in the front drive shaft may be the issue.
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Old 03-10-2014, 09:40 AM
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thank you all for your info.
going to get started to what you guy's suggested I will get back to you guys soon again thank you.
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