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  •  » repetitive noise only at 5 th gear , at highway speed

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    5/07/2019 10:31 AM  #1

    Alessandro
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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    repetitive noise only at 5 th gear , at highway speed

    Hello all, 
    i got a repetitive growl , wave , noise coming from under . It's not a ticking but a whining repetitive  , something like an old bearing . 
    Sound strange it's only at highway speed , more or less from 60 to 75  mph  and is not going faster if i go more fast . 
    This thing is matched with a vibration on floor stick , but only with 5th gear. 
    this vibration is fast and i can feel it touching it , and is quite a lot . 
    I don't know what can be the reason but all this came out after i put my car at top speed , pedal to metal until i realized she can give me more.  From that moment i got noise coming from some part that i can assume are :  clutch , transmission ( but i don't know what can be )  , differential ( i don't feel coming so rear ) . 
    More or less is coming from "center "  ( clutch/ trans )  of under car . 
    Any suggestion is welcome
    thanks as always !

     

    5/07/2019 4:30 PM  #2

    Bullet Bob
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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,891

    Re: repetitive noise only at 5 th gear , at highway speed

    If it happened after a "speed trial" you might want to check for a thrown driveshaft weight. 

    BB

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    5/07/2019 6:52 PM  #3

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
    Posts: 2,018

    Re: repetitive noise only at 5 th gear , at highway speed

    See if the exhaust system is rubbing / touching the body?

    Pull the transmission cross member to see if there are witness marks where it touches the transmission. My car has had that problem.

    Has one of the motor mounts collapsed, fatigued, broke caused contact with the frame?

    Happy hunting, it can be a royal pain in the backside to solve.

    John  -- 67 Mustang Coupe 390 5 speed
     

    5/08/2019 8:58 AM  #4

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,524

    Re: repetitive noise only at 5 th gear , at highway speed

    Does it go away when you push the clutch pedal in?

     

    5/08/2019 9:51 AM  #5

    Alessandro
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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    Re: repetitive noise only at 5 th gear , at highway speed

    TKOPerformance wrote:

    Does it go away when you push the clutch pedal in?

    i need to try again cause i was managing the exhaust and today is raining ,  as far i remember no , still remain noisy . 
    What do you think about manual stick that chatter ?

    i got feeling that clutch pilote bearing or  driveshaft angle are involved in that 
     

       •Thread Starter
     

    5/09/2019 4:39 AM  #6

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: repetitive noise only at 5 th gear , at highway speed

    If it goes away with the clutch pedal pushed in then its something in the clutch, if not then its elsewhere.

     

    5/09/2019 12:08 PM  #7

    Alessandro
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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    Re: repetitive noise only at 5 th gear , at highway speed

    TKOPerformance wrote:

    If it goes away with the clutch pedal pushed in then its something in the clutch, if not then its elsewhere.

    TKO , please do you know how to adjust angles between engine /trans/ driveshaft  . ?  i take some measures with inclinometer today , but dont realize me too much . 
    I dont know if there is a way to shim and change the axle angle. 
    I need to change engine mount or trans mount ?
    /This what i found :  slip joke 3.5  °     /  driveshaft 0.75°    /   rear axle  2.50 

       •Thread Starter
     

    5/09/2019 3:58 PM  #8

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: repetitive noise only at 5 th gear , at highway speed

    Raising or lowering the rear of the transmission can change the front angle.  Shim the trans mount to raise it, modify the crossmember to lower it. 

    The pinion angle can be changed with tapered shims under the leaf spring pads.  Make sure to use new u-bolts when you do that; they are not reuseable. 

     

    5/09/2019 4:23 PM  #9

    Alessandro
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    From: Modena -Italy
    Registered: 7/08/2016
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    Re: repetitive noise only at 5 th gear , at highway speed

    thanks !

       •Thread Starter
     

    5/09/2019 4:44 PM  #10

    Jim Bowie
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    From: Mequon Wis
    Registered: 4/08/2013
    Posts: 261

    Re: repetitive noise only at 5 th gear , at highway speed

    Something real simple is shift handle handle touching opening?

     

    5/09/2019 5:12 PM  #11

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
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    Re: repetitive noise only at 5 th gear , at highway speed

    TREMEC Toolbox is a smart phone app that will give you a pass or fail rating for drive line angles.

    If you get a fail, I’m not sure it can tell you what to look for to correct the problem.

    John  -- 67 Mustang Coupe 390 5 speed
     

    5/09/2019 8:53 PM  #12

    351MooseStang
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    From: Brookings, Oregon
    Registered: 4/03/2013
    Posts: 91

    Re: repetitive noise only at 5 th gear , at highway speed

    Generally, what you are looking for in angles are for the differential angle to be around .5 degree less than the engine/trans angle. This is to account for the spring wrap that causes the pinion to rise when power is applied. For more powerful engines and more 'spirited' driving/racing, some prefer to have around .75 to 1 degree less angle than the engine/trans at the rear. Using your numbers, you would want to change the engine trans angle to 3 degrees or raise the pinion angle to 3 degrees (+.5 degree).

    If you have the tunnel clearance a shim under the trans mount would be the easiest way to change things up. That's what I did when I was aligning mine and it works great.

     

    5/11/2019 2:51 AM  #13

    Alessandro
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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    Re: repetitive noise only at 5 th gear , at highway speed

    Jim Bowie wrote:

    Something real simple is shift handle handle touching opening?

    no , it's free to play 
     

       •Thread Starter
     

    5/16/2019 12:14 PM  #14

    Alessandro
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    From: Modena -Italy
    Registered: 7/08/2016
    Posts: 707

    Re: repetitive noise only at 5 th gear , at highway speed

    351MooseStang wrote:

    Generally, what you are looking for in angles are for the differential angle to be around .5 degree less than the engine/trans angle. This is to account for the spring wrap that causes the pinion to rise when power is applied. For more powerful engines and more 'spirited' driving/racing, some prefer to have around .75 to 1 degree less angle than the engine/trans at the rear. Using your numbers, you would want to change the engine trans angle to 3 degrees or raise the pinion angle to 3 degrees (+.5 degree).

    If you have the tunnel clearance a shim under the trans mount would be the easiest way to change things up. That's what I did when I was aligning mine and it works great.

    Thanks , i am trying some shims under transmission , checked again , and take a ride . Incredibly much more better and  groal sound is very few or desappear .  Seems that really was a pinion angle issue . This is a first step , then i will handle rear axle or engine mount . 
    thanks for precious info
     

       •Thread Starter
     

     

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