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Thread: Grinding noise..again..

  1. #1
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    Default Grinding noise..again..

    Hey u guys..I swapped this HCI motor in on the stock AOD..and used to beat it on the highway,at speeds around 110mph this LOUD grinding noise would come from the mid/front of the car..I thought this might be because of the stock tranny giving away..I swapped to a T-5 with beefed up internals..and still i have the grinding noise..would any accessories on the engine belt make such a grinding noise at around 4,000k rpms at around 110-140mph?

    Thanks in advance for ur help =)..
    1987 351 swap, T5, ac/smog/power steering delete, custom H pipe Borla ProXS mufflers..

  2. #2
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    does it do it at 4,000 rpm in neutral

    1974 maverick lsx powered turbo car SOLD
    1973 maverick Tijuana Taxi Tribute
    1957 chevy LSX Turbo project (race car)
    Owner of Joe Dirt Fabrication

  3. #3
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    nope..in the first 3 speeds i rev it up to 6k and no problems..in 4th at 4k rpm i get the sound,and if a shift to 5th at the same speed i still get the noise..
    1987 351 swap, T5, ac/smog/power steering delete, custom H pipe Borla ProXS mufflers..

  4. #4
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    still have the dampner on the rear end?

    1974 maverick lsx powered turbo car SOLD
    1973 maverick Tijuana Taxi Tribute
    1957 chevy LSX Turbo project (race car)
    Owner of Joe Dirt Fabrication

  5. #5
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    Your grinding your teeth because your going so fast! Start yelling at those speeds and it wont happen any more.
    Three 88's

  6. #6
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    But in reality. Maybe your wheel bearings? Mine start to hum at about 2 gear, they are really bad though.
    Three 88's

  7. #7
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    yes still have the damper on the rearend..no my teeth are intact :P..
    1987 351 swap, T5, ac/smog/power steering delete, custom H pipe Borla ProXS mufflers..

  8. #8
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    Tires hitting something? They can change shape at high speeds.

  9. #9
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    Actually that makes me think. Do you have tires that are rated for those speeds? Tires can start to shake at high speeds.
    Three 88's

  10. #10
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    This may seem odd, but are your U-joints in fit shape, I used to have a bad one on mine, and it would vibrate around 55-60 mph, and again about 75-82 mph...
    At least I changed it, and it hasn't done it since...
    '87 Mustang notch; 5 lug, PBR calipers, 3.55 gears, SFC's, mild 5.0 with '40P's, Cobra intake, E cam, BBK headers and X pipe, Flowmaster exhaust.
    "still slower than your grandma's scooter"..

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