Vibration above 3k

alabamastanger · May 29th, 2008, 11:46 AM

I have vibration above 3k in every gear (Tremec 3550). I have 3:73's, but they were there when I got the car. Could this be my gears?

HMUSN · May 29th, 2008, 11:49 AM

I would think more along the lines of a bad u joint

alabamastanger · May 29th, 2008, 11:53 AM

How hard is it to change the u-joint?

HMUSN · May 29th, 2008, 11:55 AM

YouTube - Replacing the Universal Joints

nolife · May 29th, 2008, 12:07 PM

Originally Posted by alabamastanger

I have vibration above 3k in every gear (Tremec 3550). I have 3:73's, but they were there when I got the car. Could this be my gears?

How about 3k rpm when not moving or moving at a decent speed while in neutral. Any difference there? U-joints, driveshaft and rear gears problems should not be related to a certain engine rpm, they move proportional to the cars speed, not the engines speed.

trueblue01 · May 29th, 2008, 12:48 PM

Originally Posted by nolife

How about 3k rpm when not moving or moving at a decent speed while in neutral. Any difference there? U-joints, driveshaft and rear gears problems should not be related to a certain engine rpm, they move proportional to the cars speed, not the engines speed.

+1. If the vibration leaves and comes back everytime you shift gears and throttle up, it's somewhere between the harmonic balancer and the input shaft of the trans. U joints could cause a similar vibration that would seem to get worse when the shaft is put under heavy load and then calm down when going at a constant speed but it would still be there when ever the shaft is rotating.

chickenbot · May 29th, 2008, 03:15 PM

i just had that prob and it was the harmonic balancer and it just kept getting worse.. but when i changed out the harmonic balancer it was all good

alabamastanger · May 29th, 2008, 06:04 PM

The vibration is at & above 3k, whether I'm in 1st doing 30, or 4th doing 45. I can rev it up when it's out of gear, and the vibration is there above 3k. So now I'm guessing it's not the u-joint?

Squints · May 29th, 2008, 06:17 PM

what about motor mounts.

1989Gt. · May 29th, 2008, 06:27 PM

Originally Posted by Squints

what about motor mounts.

could be

ujslost · May 29th, 2008, 06:55 PM

im calling balancer or driveshaft.

chickenbot · May 29th, 2008, 07:01 PM

Originally Posted by ujslost

im calling balancer or driveshaft.

+1 balancer

like i said i had this exact same prob

May 29th, 2008, 11:46 AM	#1
alabamastanger Regular 1983 Mustang GT N/A Join Date: Feb 2007 Location: Tucson, Az Posts: 121 iTrader: 0 reviews	Vibration above 3k I have vibration above 3k in every gear (Tremec 3550). I have 3:73's, but they were there when I got the car. Could this be my gears?

May 29th, 2008, 11:49 AM	#2
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	I would think more along the lines of a bad u joint __________________

May 29th, 2008, 03:15 PM	#7
chickenbot Enthusiast 1990 mustang gt eventually Join Date: Nov 2007 Location: plano, tx Posts: 938 iTrader: 0 reviews	i just had that prob and it was the harmonic balancer and it just kept getting worse.. but when i changed out the harmonic balancer it was all good __________________ 1990 gt 5.0 Mac Performance 76mm straight shot intake 70mm Accufab tb and egr spacer Trick Flow Track Heat u/l intake 3.55 gears MSD distributor, Blaster Coil, and 8.5mm wires

May 29th, 2008, 06:17 PM	#9
Squints 2008 Hammock Rodeo Champ 2003 F-150 Lariat FX4 Supercab Join Date: Dec 2007 Location: VB,VA Posts: 1,236 iTrader: 0 reviews	what about motor mounts. __________________ i have no mustang. so don't listen to anything i say.

May 29th, 2008, 06:55 PM	#11
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	im calling balancer or driveshaft. __________________ 1986 Mustang GT t-top time piece!

May 29th, 2008, 11:53 AM	#3
alabamastanger Regular 1983 Mustang GT N/A Join Date: Feb 2007 Location: Tucson, Az Posts: 121 iTrader: 0 reviews	How hard is it to change the u-joint?

May 29th, 2008, 06:04 PM	#8
alabamastanger Regular 1983 Mustang GT N/A Join Date: Feb 2007 Location: Tucson, Az Posts: 121 iTrader: 0 reviews	The vibration is at & above 3k, whether I'm in 1st doing 30, or 4th doing 45. I can rev it up when it's out of gear, and the vibration is there above 3k. So now I'm guessing it's not the u-joint?

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