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Vibration at 3100 RPM..anyone have this problem?

  • Thread starter Thread starter 1BAD93
  • Start date Start date Nov 21, 2006

1BAD93

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Oct 29, 2001
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Nov 21, 2006
#1
  • Nov 21, 2006
  • #1
Doesnt matter which gear i'm in once the car has warmed up i get a vibration/hum that lasts from 3100 to about 3400 rpm. It feels/sounds likes it comes from the middle-rear of the car but i'm not really sure. It seems to have started a couple months after i installed a catted mac prochamber. I'm thinking it may be a bad cat or maybe its just the sound the prochamber makes and there isnt anythign i can do about. Any ideas.

Joe
 
K

Kilgore Trout

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#2
  • Nov 21, 2006
  • #2
Could it be the driveshaft? Did you remove your dog bone?
 

1BAD93

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Nov 21, 2006
#3
  • Nov 21, 2006
  • #3
No i never removed the dog-bone. I should check to make sur eit didnt fall off. If it is the driveshaft what are my options, aluminum replacement or can it be balanced?
 
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Kilgore Trout

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#4
  • Nov 21, 2006
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If you removed the driveshaft did you mark it so it went back on correctly?
 

1BAD93

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#5
  • Nov 21, 2006
  • #5
I never removed the driveshaft? or the dog bone? Only mods are catted prochamber, magnaflows, and a K&N FIPK
 

COramprat

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#6
  • Nov 21, 2006
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Is this while moving or just idling?
 

1BAD93

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#7
  • Nov 21, 2006
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This is while moving. Its even more pronounced under acceleration load..but you can feel it during decel as well while going though that RPM band.
 

COramprat

...I can take it. I think.
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#8
  • Nov 21, 2006
  • #8
Probably a bad U joint. Crawl under the car and see if there is any excessive play in the joint.
 

1BAD93

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Nov 21, 2006
#9
  • Nov 21, 2006
  • #9
Thanks. I'll have to check it when i get out of work. Any idea how muhc play is excessive. If i try and move the driveshaft there will be play from the transmission but how can i specifically check the u-joint
 

COramprat

...I can take it. I think.
20+ Year Stangneter
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#10
  • Nov 21, 2006
  • #10
Try to move just the knuckles of the joint. If they move any you need to get a new one.
 

1BAD93

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Nov 22, 2006
#11
  • Nov 22, 2006
  • #11
COramprat said:
The rundown on my bad DS was at around 2000rpms I would get a real deep moan that resonated throughout the car. Like a subwoofer with a steady hum. I would do it in each gear and at about the same rpms.
Click to expand...

I just read this post you made on another thread. That is the exact way i would describe the sound. I tried getting under there to wiggle the u-joint but it really didnt move. What did you do to fix yours..did you replace the driveshaft or have it balanced?
 

HoustonGT

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Nov 22, 2006
#12
  • Nov 22, 2006
  • #12
1BAD93 said:
I just read this post you made on another thread. That is the exact way i would describe the sound. I tried getting under there to wiggle the u-joint but it really didnt move. What did you do to fix yours..did you replace the driveshaft or have it balanced?
Click to expand...
Bah! That explains the damn sound i've been getting lately with my vibration.
how much is it gonna run me for a new u-joint and driveshaft balance?
 

1BAD93

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Nov 22, 2006
#13
  • Nov 22, 2006
  • #13
I'm wondering the same thing. An new aluminum one will run 270
 

HoustonGT

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Apr 6, 2003
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Houston
Nov 22, 2006
#14
  • Nov 22, 2006
  • #14
1BAD93 said:
I'm wondering the same thing. An new aluminum one will run 270
Click to expand...
Yea i'm just wondering if the aluminum driveshaft is worth that much. I remember about 2 years back when that sucker was like $159 and then the price of metal skyrocketed and so did the cost of the driveshaft and all the exhaust systems as well.
 
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Kilgore Trout

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#15
  • Nov 22, 2006
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I got an aluminum driveshaft by trading my GT for a Terminator...
 

COramprat

...I can take it. I think.
20+ Year Stangneter
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#16
  • Nov 22, 2006
  • #16
1BAD93 said:
I just read this post you made on another thread. That is the exact way i would describe the sound. I tried getting under there to wiggle the u-joint but it really didnt move. What did you do to fix yours..did you replace the driveshaft or have it balanced?
Click to expand...
Yea...bought an aluminum one for $159 Now you have to add a hundred.

If you have a bad u-joint just get a new one. Not hard to swap out and they are about 35-40 bucks I think.
 

Mustang5L5

That is…until I whipped out my Bissell
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#17
  • Dec 7, 2006
  • #17
One PITA way to find out...swap the stock pipe back on
 

the98stang

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Dec 8, 2006
#18
  • Dec 8, 2006
  • #18
It's most likely the exhaust.

The U-joint will hold up for quite some time unless you've messed with the DS before
 
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