2008 Ford F-150 Logo
Jonathan Arnold Posted on Sep 11, 2013
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Rear end makes thump when starting from stop.whether fwd or backward incline seems to be harder thump ! Too nervous to dare romp on it im afraid something might break ! Any suggestions?

  • Jason S Sep 16, 2013

    Have someone else drive it while you stand outside and listen to narrow down the problem area. It sounds like something in your drivetrain but that is very broad. If the sound is near the rear wheels check the back of the driveline for anything that could be interfering or worn U-joints. Also could be in your differential, if you have a locker or limitied slip differential then this could be the source and not neccesarily a problem. Check the rear axle and any other moving parts to ensure there is no interference. If the sound is towards the middle of the truck look at the front of the driveline or possible binding in your torque converter or transmission.

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Randy Handy

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  • Posted on Sep 11, 2013
Randy Handy
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More than likely it's the u-joints either front or rear.

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  • Posted on Sep 16, 2013
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Have someone else drive it while you stand outside and listen to narrow down the problem area. It sounds like something in your drivetrain but that is very broad. If the sound is near the rear wheels check the back of the driveline for anything that could be interfering or worn U-joints. Also could be in your differential, if you have a locker or limitied slip differential then this could be the source and not neccesarily a problem. Check the rear axle and any other moving parts to ensure there is no interference. If the sound is towards the middle of the truck look at the front of the driveline or possible binding in your torque converter or transmission.

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Anonymous

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  • Posted on Jun 28, 2008

SOURCE: 1993 ford f150 5 liter manual trany 4x4

if there is a clip holding the speedo cable into the speed sensor--remove clip--pull & twist---or remove the 10 mm bolt & remove the speed sensor

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Anonymous

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  • Posted on Jun 07, 2010

SOURCE: 1999 Ford Explorer 4WD v6 when I come to a complete stop.

Look for a broken trailing arm, or loose bolts or degraded rubber grommets on it. This is a piece of the suspension that goes from the frame to the strut. It holds the strut in place vertically. When broken or loose this truck can bang around back and forth. It could also a a worn out universal joint which can be hard to detect because even the slightest amount of play can cause noises. Perhaps even a loose brake caliper. But the gears in the differential may be becoming worn and sloppy as well. You can check up a rear tire and try moving it back and forth to see how much played there is in the differential and universal joint.

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