Question about 2000 Jeep Grand Cherokee

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My 2000 Jeep grand Cherokee will sometimes will vibrate and grab; like going over a grate before a stop sign. My mechanic has taken it for drives and it doesn't do it. He thought maybe the crank shaft? Please let me know if you have advice. Thank you. Robyn.

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  • Obertelli
    Obertelli Sep 13, 2010

    Does the problem occur in both 2wd and 4wd settings? Have you left the hubs locked?

  • Romeorg Sep 13, 2010

    It is in 2 wheel drive.

  • Romeorg Sep 17, 2010

    Thank u for your advice back obertelli. The mechanics working on my Jeep took the transfer case apart and nothing wrong there. So now they r going to check the bushings. They said the axles r good also. So I don't know what else to do but wait. Thank you. Robyn.



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BTW: get a new mechanic. A crankshaft would NEVER cause intermittent symptoms like yours. Your mechanic is either incompetent, dishonest, or both.

Posted on Sep 13, 2010

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  • Obertelli
    Obertelli Sep 13, 2010

    See a 4WD specialist. If the wheel hubs have not been accidentally left locked, then you most likely have transmission lock-up. This may be a really simple electrical or linkage fault and at worst it may be an expensive fault in the transfer box (distributes drive between all four wheels and selects from 2wd to 4wd.

    If you do have lock-up, left unattended the fault will get worse and can cause you to lose control if it happens when cornering. It also won't be doing your expensive tyres many favours either.

    Simple causes such as minor faults and/or user errors are the most common cause of lock-up. Lock-up causes a lot of strain on other parts and can cause them to break, so it's in your interests to use the vehicle as little as possible (preferably not at all) and to get it promptly to a specialist.

  • Romeorg Sep 14, 2010

    I took your advice and you were right. I took the Jeep to a different mechanic and they as well as discovered problems with the transfer case and it wouldn't come out of 4 wheel drive. So it is with them for awhile.
    Do I have any recourse on the original mechanic? I just spent $300 to fix the rear axle seals and 2 rear bearings. He also replaced a plug for the fluid to the transfer case.

    Thank you for your information and time.


  • Obertelli
    Obertelli Sep 14, 2010

    Happy to have been of assistance, Robyn.

    Regarding the $300, unless you have witnesses who were with you when the last mechanic told you that his work was required to fix your lock up then you haven't any real chance of recovering the money. It'll be your word against his, and he may claim that the work was for a totally different reason and that you verbally authorised him to go ahead.

    Don't just walk away though. If you have recourse to free legal or consumer advice then seek it; as I live in England I know exactly what to do on my patch, but I'm unable to reliably advise you as to your remedies on your side of the pond. Rattle his cage as much as you can safely do so and without chucking good money after bad. Even if you don't get anywhere the local authorities will have to pay attention if enough people complain of being charged for incompetent and unnecessary work. Mechanics can and do make honest mistakes, but in this case the symptoms were unmistakeably indicative of a transfer box issue and any half-decent mechanic should have immediately started to look there if the fault was described as you did in your original question. Suggesting the fault may be with the crankshaft was a cynical ploy to immensely pad the bill and still wouldn't have fixed the fault.

    All the best, and hope you get your vehicle back on the road soon at minimum additional expense.



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