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Rear end noise after rebuild!

Discussion in 'Driveline' started by Svt_devin, Apr 22, 2019.

  1. Svt_devin

    Svt_devin SVT Devin Established Member

    Messages:
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    Joined:
    Jun 6, 2018
    Location:
    Indiana
    So sad to say it but I money shifted the cobra from top of 3rd to 2nd... anyway It broke the diff cover and that's it (atleast I thought). I order Ford racing reinforced diff cover and ftbr bushings and diff mount. Installed all of it in my garage everything torqued to spec and done exactly as they say in the directions. Get the car back together and all seems well at first. I'm getting the "cobra clunk", I think worse than before, when I'm in first if I just bump the throttle and make the car jerk it's clunking in the back not when I'm shifting or driving but when it's actually jolted. Next thing is I'm hearing a gear whine in the rear end like I never did before. Louder when I'm giving it any throttle, gets quite when I coast. I know it has fluid because I over filled it and it blew out of the vent so that isn't the problem. Please any help is greatly appreciated!! 20190408_203342.jpeg 20190407_015029.jpeg

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  2. slo984now

    slo984now AKA 01yellerCobra Established Member

    Messages:
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    Oct 5, 2005
    Location:
    San Diego
    Did you check the pinion as well? I bet its loose. You tweaked the case pretty hard if you broke the cover. Did you check everything over or did you just install the new cover?
     
  3. Svt_devin

    Svt_devin SVT Devin Established Member

    Messages:
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    Joined:
    Jun 6, 2018
    Location:
    Indiana
    I checked everything over very well. Pinion seemed perfectly fine at the time

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  4. olympic

    olympic Well-Known Member Established Member

    Messages:
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    Dec 28, 2014
    Location:
    SK, Canada
    Probably norrmal. Solid mounts transmit A LOT of diff noise into the chassis. I have Max Motorsports busings and mount and have the clunk and a fair amount of gear whine.
     
  5. First-on-race-day

    First-on-race-day Member Established Member

    Messages:
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    Joined:
    Aug 2, 2018
    Location:
    Longview Texas
    Get the rear on jackstands and have someone engage and dissangage the clutch in 1st gear quickly to shock the rear so u can see what is moving and cluncking

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  6. nxhappy

    nxhappy Vette Killer Established Member

    Messages:
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    Joined:
    Dec 16, 2006
    Location:
    Kalifornia
    lash adjustment is off. So no, it's not normal. Drive it till she blows, or rebuild it again. Those are your options.
     

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