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89 Bronco II 4x4, 6 cyl., chirps and clanks (badly) upon acceleration (clanking especially bad in 4x4 low) sounds like something is going to fall off. The clanking was minimal at first and has become extreme. Coming from underneath somewhere in the middle of the undercarriage. Once at a higher speed, the clanking sometimes stops but once stopping and accelerating, it is extreme again and the front end has started to shimmy. Please help!

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Accelleration noises of the magnitude you descibe makes me think the engines crank shaft bearings have gone. Has the oil pressure light come on recently and what's the oil level like.
Without being there to hear it, it's very difficult to diagnose. You should detect noises and rattle if you rev it when in neutral if it is the engine. If the engine is smooth in neutral and the oil is good you may have a bad diff or cv joint

Posted on Jan 10, 2013

  • Daniel Bakewell Jan 10, 2013

    (CV joint also called U-joint by many) ...and if by shimmy you get an up and down, or more bouncy ride I would suggest this is the issue.

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SOURCE: 99 Z-71 extended cab. Cracking or Clanking when

Most likely the U-Joints. It shouldn't be driven until they are fixed. You can check them by crawling under the truck and simply grabbing the driveshaft and turning it with your hand. You'll be able to see right away if they are tight or sloppy. Any slop at all means the U-joints are bad. Make sure to set the parking brake first and put the truck in neutral before crawling under it.

Posted on Dec 28, 2010

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