Vibration between 50 & 70 mph

Discussion in 'Issues, Repairs, Warranty, TSB, Recalls' started by icarumba, Jan 21, 2015.

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Do you experience vibration and rumbling between 50 and 70 mph?

  1. No

    53.8%
  2. Yes - V8/MT

    20.2%
  3. Yes - V8/AT

    12.5%
  4. Yes - V6/MT

    1.1%
  5. Yes - V6/AT

    3.6%
  6. Yes - EB/MT

    2.4%
  7. Yes - EB/AT

    6.3%
  1. Lo Pony

    Lo Pony Well-Known Member

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    86 GT, red; 88 LX 5.0, black; 95 GT black; 99 Cobra with mods (still own); ‘16 GT, PP, manual, Ruby, drivetrain vibration!; Traded for ‘19 GT, A10, velocity blue, love it.
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    I really liked the post on here about the rubber giubo at the back of the transmission where some of the mating flange bolts were found to be bent. I think wear on that part could very well be the culprit in why the vibrations show up after some use.
     
  2. ANGST

    ANGST Well-Known Member

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    Odd thing I noticed yesterday . After the weather here being cool 40s-60s , we had a shoot up to 92+ degrees . Tire pressure went up slightly from 31/32 , to 34psi . The noise was hardly noticeable at all.
     
  3. Dominant1

    Dominant1 Well-Known Member

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    *****i have a correction to a torque spec i posted with the crossmember bolts when using shims i stated it was 46lbs when in fact its 85lbs**** sorry for the miscommunication!!!!
     
  4. HoosierDaddy

    HoosierDaddy Well-Known Member

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    Not sure where you posted the wrong numbers but you can edit the original post to fix it which would ensure no future confusion (or cross-members falling off - LoL)
     
  5. Dominant1

    Dominant1 Well-Known Member

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    Done!!!!!
     
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  6. shelbywannabe

    shelbywannabe Well-Known Member

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    Does anyone know the tsb number on this as I have the same issue. Very mild right now but it's definitely there.
    Thanks
     
  7. ANGST

    ANGST Well-Known Member

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  8. shelbywannabe

    shelbywannabe Well-Known Member

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    Thanks
    I will look into this and get the ball rolling. I hope its not as bad as what some others have went through
     
  9. HoosierDaddy

    HoosierDaddy Well-Known Member

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    This is weird. I needed to remove the cross member bolts for my M6 and remembered your post. I don't have a service manual so double checked the maximum torque rating for my bolts which are marked 8.8 and take an 18mm socket. Based on this chart (http://electronicfilters.tpub.com/TM-10-4330-237-13P/css/TM-10-4330-237-13P_105.htm), the maximum torque for that bolt (M12, 18mm head) is 63 lb.ft.

    I know you have an automatic and the bolts could be different but you posted 85 lb.ft which just happens to be the maximum torque in Nm for my bolts. You might want to check and make sure you weren't posting the Nm value and calling it ft.lbs.
     
  10. Dominant1

    Dominant1 Well-Known Member

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    I got the specs from the sticky posted on this site:

    All the torque values you will ever use!

    Front Suspension:
    BMR Camber Bolt (18mm / 21mm): 125 ft/lbs.
    Factory Upper/Lower Strut to Knuckle Bolt (21mm / 24mm): 184 ft/lbs.
    Upper Strut Mount Nuts x 3 (15mm deep): 46 ft/lbs.
    Strut End Bolt (Do not remove without compressing the spring) (21mm): 76 ft/lbs.
    Brake Caliper Bolts (15mm): 85 ft/lbs.
    Sway Bar End Links (18mm / 17mm): 85 ft/lbs.
    BMR Sway Bar End Links (19mm / 14mm): 85 ft/lbs.
    Front Sway Bar Mounts (18mm):
    BMR Sway bar Mounts (10mm allen):
    Front Lower Control Arm (24mm): 184ft/lbs
    Front Lower Control Arm Nut to Spindle: 85 ft/lbs.
    Rear Lower Arm to Frame: 184 ft/lbs.
    Rear Lower Arm Outboard Nut to Spindle: 85 ft/lbs.
    Cowl Extension (Upper K brace): 26 ft/lbs.
    Strut Tower Cross Brace (15mm deep): 41 ft/lbs.
    BMR Front Subframe Chassis Brace Rear Bolts (1"): 100 ft/lbs.
    Inner Radius Arm Bolt (24mm):
    Tie Rod to Spindle (18mm):
    Steeda Extreme G-Trac Brace Front (10mm allen): 60 ft/lbs.
    Steeda Extreme G-Trac Brace Rear (22mm): 60 ft/lbs.
    Front spindle/hub nut: 251 ft/lbs.



    Body/General
    Oil Drain Plug: 19 ft/lbs EB+V6: 20 ft/lbs.
    BMR Jacking Rails (15mm): 63 ft/lbs.
    Lug Nuts: 148 ft/lbs.
    Front Exhaust Clamp: 35 ft/lbs.
    Exhaust Hangers: 18 ft/lbs.
    Windshield Wiper Pivot Arm Nuts: 26 ft/lbs.
    Negative Battery Cable: 44 in/lbs.
    Transmission Cross Member (18mm): 85 ft/lbs.
    BMR Driveshaft Loop (3/8"): 40 ft/lbs.
    Front Belly Pan (7mm):
    Differential Drain and Fill Plugs: 25 ft/lbs.
    Water Pump Pully: 18 ft/lbs. EB: 177 in/lbs. V6: 18 ft/lbs.


    Rear Suspension
    Front Inner lower control arm bolts (24mm): 166 ft/lbs.
    Rear Inner lower control arm bolts (24mm): 184 ft/lbs.
    Outer control arm bolt (21mm): 203 ft/lbs.
    Shock to Upper Shock Mount Nut: 22 ft/lbs.
    Upper Shock Bolts: 66 ft/lbs.
    Lower Shock bolts (15mm): 35 ft/lbs.
    Main Cradle Bolts (21mm): 129 ft/lbs.
    Front Cradle Bracket Bolts (13mm): 41 ft/lbs.
    Rear Sway Bar Mount (13mm): 24 ft/lbs.
    BMR Rear Sway Bar Mounts (13mm): 24 ft/lbs.
    BMR Rear Sway Bar Thrust Washers (3/16" allen):
    Sway Bar End Links (15mm / 18mm / 6mm allen): 85 ft/lbs.
    Stabilizer Bar Bracket Bolts: 52 ft/lbs.
    BMR Sway Bar End Links (19mm / 14mm): 85 ft/lbs.
    BMR Sway Bar End Links Jam Nuts (19mm):
    Rear Swaybar Endlink Brake Hose Mount (10mm):
    Vertical Link Upper Bolt (15mm): 76 ft/lbs.
    BMR Vertical Link Upper Bolt (19mm): 81 ft/lbs.
    Vertical Link Lower Bolt (18mm): 129 ft/lbs.
    Toe Rod Inner Bolt (18mm / 21mm): 129 ft/lbs.
    Toe Rod Outer Bolt (18mm): 129 ft/lbs.
    BMR Toe Rod Inner Bolt (22mm x 2): 129 ft/lbs.
    BMR Toe Rod Outer Bolt (22mm): 129 ft/lbs.
    Camber Arm to Knuckle: 76 ft/lbs.
    Camber Arm to Subframe: 85 ft/lbs.
    Rear Brake Caliper Bolts: 24 ft/lbs.





    Bump Stops

    Bump stop trim dimensions for lowered cars pictured below. FRPP Bump stops are identical (same durometer as well) to the factory ones other than cut down. Save money and either cut your originals or order factory replacements to cut.



    Alignment

    Factory Spec
    Front - Camber: -1.03 Total Toe: 0.00
    Rear - Camber: -1.50 Total Toe: 0.23

    Ford Performance Spec
    Front - Camber: -1.55 Total Toe: 0.00
    Rear - Camber: -1.98 Total Toe: 0.23
     
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  11. Cobra Jet

    Cobra Jet Well-Known Member

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    So here's the update:

    The new rear diff was received directly from Ford and installed 1.5 weeks ago, so far so good. I only feel normal NVH characteristics due to changes in road surfaces and the common 2.3 engine "buzziness" (when it's lugging at lower RPMs).

    Also to note:
    The previous SSM that was applied months ago (hose clamps to driveshaft balance) has been reversed off of my vehicle after the new diff was installed.

    I do not feel the definitive, abrasive and harsh driveline vibes throughout the vehicle as noted previously in all of my prior posts to this issue. Definitely do not feel it in the seatback anymore. Even at lower speeds, the ride is really smooth - whereas previously, the ride always felt like I was driving on an ungraded road surface. The car actually feels more solid, hard to explain, but prior to the new rear diff, the car felt loose and clunky with the old rear diff.

    Summary:
    1) Driveline vibe heavily documented at only 1,900 miles into my "New Car Ownership".
    2) Ford CSR Rep involved for many months.
    3) Ford Engineering Team involved on multiple occasions who gave directives to Service Center.
    4) Local Ford Engineer brought to Service Center on a few occasions for guidance/diagnosis.
    5) Vibe Analyzer tool used multiple times for diagnosis.
    6) Multiple warranty diagnosis and replacement of various driveline components performed from Jan 2016 up through May 2017.
    7) At 23k miles the PP 3.55 rear diff has been replaced with a brand new PP 3.55 rear diff.
     
  12. kh1818

    kh1818 Well-Known Member

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    Meant to provide my update sooner, however also like Cobra Jet I had my rear diff replaced with a new one from the factory at 1000 miles, and I would say that the vibration is 98% corrected. I think I am still feeling some kind of vibration at 65-75 mph, however it is so insignificant I still cannot make up my mind if it is drivetrain related or just how the car is supposed to feel. Overall, I am happy and think I can close my concern on this issue for now and finally start enjoying the car.
     
  13. markw24

    markw24 markw24

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    Rule that out by dropping tire pressure to 28 front and 25 rear. This should tell you if gtp drive line or the road.
     
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  14. kh1818

    kh1818 Well-Known Member

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    Thanks - I'll give that a shot
     
  15. shelbywannabe

    shelbywannabe Well-Known Member

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    Did this help with the bad clunking when going into gear from a stop? Mine is worse than ever and I notice a vibration/drone in the car from 50+ mph and its at its worse at 60-65. It goes in on June 1st, I hope they take this seriously as the drone at 60 is aggravating
     
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