Question about 2004 Toyota Tacoma

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Loose carrier bearing? /drivetrain ''thud''

'04 Taco Prerunner TRD 3.4L SR5, Auto Trans (all stock), 52K miles. What's the acceptable amount of vertical ''play'' in the driveshaft carrier bearing?

I'm experiencing a ''thud'' of sorts after I've come to a complete stop (with pressure still on the brake pedal). Sometimes it doesn't occur until I lift off of the brake to start moving (before I even step on the gas), as if the drivetrain is unloading itself. This occurs even when I lock the rear diff, and whether the truck is empty or fully loaded (800 lbs or so). I've checked the obvious things such as u-joints/motor mounts/carrier bearing. The carrier bearing is the only thing that seems to be suspect as I can move it up and down about 1/2'' in its bracket. This is the first auto trans Toy I've ever owned as well as the first with a carrier bearing so I don't know if this is just a normal characteristic of the unit. Thanks in advance for any advice you can offer me.

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  • 2wlterr Aug 02, 2010

    Thanks for the info. I'll check out the rear end.

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  • Toyota Master
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The service manual that i have says that the accepted travel is 5mm, what you have - ~15mm  - is way too much, the rubber bushing appears to be defective. But i seriously doubt it's the cause of your problem - it can't vibrate if you haven't pressed the gas pedal.
That thud, since you are hearing mainly when you stop, sounds to me that it's coming from the rear suspension as it settles after the breaking. Check al the bushings of the suspension, one might be worn out. If you find a loose one then replace all.

Posted on Aug 02, 2010

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  • Toyota Master
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WHEN YOU HEAR DRIVE SHAFT NOISE BEARINGS IS WORN OUT NEEDS.REPLACING.

Posted on Aug 02, 2010

  • Jonah Oneal Aug 02, 2010

    DO THIS TAKE TRUCK TO GARAGE THEY HAVE TO USE A SPECIAL GAUGE CALL SPIRIT LEVEL GAUGE.THIS GAUGE IS USED TO CHECK THE UNIVERSAL JOINT ANGLE. YOUR REAR AXLE HOUSING AND LEAF SPRINGS MIGHT HAVE TO HAVE TAPERED WEDGES PUT IN TO GET DRIVE ANGLE RIGHT FIRST.THEN YOU WILL KNOW IF UNIVERSAL JOINT BEARINGS IS BAD.

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