Vibration in drivetrain

jamilla · October 3rd, 2009, 08:09 PM

Ok so some of you know that I recently installed a new pro motion trans. Than I developed a serious vibration. It was my HB. I have since noticed a vibration in the shifter and seat of my pants. It is mainly under power or higher speed. Push in the clutch and it goes away. So it's not my DS. It's a tight vibration and can't tell if it speeds up or down w/ RPM. I just notice it when I am WOT or in fifth at 80 mph not at 75 but it starts at 80. Any sugg.? Clutch?

jamilla · October 4th, 2009, 06:52 PM

anyone?

ReverendDexter · October 4th, 2009, 06:57 PM

Have you checked your driveshaft->diff bolts?

I had a death-rattle that would come on around 55, turned out 3 of mine were loose and one was missing

Replaced the lost one and tightened everything up, all was happy.

Even if that's not it, I'd get under the car and check for anything lose in the drivetrain.

jamilla · October 4th, 2009, 07:00 PM

so you think maybe just something loose? I used red loctite on the DS bolts. Definitely check them though.

86er · October 4th, 2009, 07:36 PM

did you grease up the throw out bearing? If it goes away when the clutch is pressed in, then you have pin pointed the problem, its either the clutch, throw out, or something in your trans possibly.

jamilla · October 4th, 2009, 09:34 PM

Just drove it tonight and noticed that it doesn't seem to do it in 1-3. starts in 4 and gets worse in 5th and mainly w/ more speed. It's like chasing a mouse.

jamilla · October 6th, 2009, 01:01 AM

anyone else?

jamilla · October 6th, 2009, 01:25 PM

So i checked the DS bolts, trans bolts, trans cm bolts, etc. and all are tight. Could my CM bushing be bad? I did not replace it when I did the trans. Also I noticed a little wiggle in my u-joint near the rear. I held the rear diff plate that the bolts go into and tried moving the DS and it wiggled. Any help would be nice b/f i start buying parts to chase a prob.

jamilla · October 7th, 2009, 12:21 AM

surprised that no one has a clue! I'm not surprised I don't!

jamilla · October 9th, 2009, 10:44 PM

Still need help

1Fast93GT · October 9th, 2009, 11:58 PM

i doubt your flywheel has any warpage, did you get it turned or buy a new one when you put the new trans in? also, the rear gears may have a chipped tooth or differential fluid is low...other than that, I have no idea.

92WhitePNY · October 10th, 2009, 12:06 AM

Mine does the same above 70 in 4th and 5th. But I think its the cross member bushing. And worn motor mounts don't help. Didnt start till after I remounted my trans from changing my flywheel and clutch.

Traidmarx · October 10th, 2009, 11:04 AM

check your universal joints mine did the exact same thing. the universal joints were shot. Especially if your driveshaft has play in it like your describing.

93hatch · October 10th, 2009, 07:20 PM

did you swap flexplates?

jamilla · October 11th, 2009, 12:40 PM

no to the flex plates. It didn't do it right after the new trans. More like after a few power shifts.

flyin ryan · October 13th, 2009, 12:39 AM

I would check the balancer and also pull the rear dif cover and look for any cracks. I've blown a factory trac lock before where it wasn't fully blown. It was cracked from one side to the other and made a bunch of vibs from idle to 4500rpms

just some ideas, update when you do find the issue i'd like to know

86er · October 13th, 2009, 02:13 PM

i believe he just put a new HB on the car

jamilla · November 2nd, 2009, 09:25 PM

So I finally got around to checking the u-joint's and guess what, that was the problem. One of the rear dust covers failed and ALL the bearings were gone! So I replaced them and will test drive on Wed. Just thought I would let you guys know.

black89GT · November 2nd, 2009, 09:27 PM

Good stuff man glad it worked out to be pretty easy for you.

jamilla · November 7th, 2009, 10:09 PM

Holy crap! what a difference. Finally drove it today and I guess it's been bad for a while, cuz it has never drove this smooth. Wish I had known sooner.

October 3rd, 2009, 08:09 PM	#1
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	Vibration in drivetrain Ok so some of you know that I recently installed a new pro motion trans. Than I developed a serious vibration. It was my HB. I have since noticed a vibration in the shifter and seat of my pants. It is mainly under power or higher speed. Push in the clutch and it goes away. So it's not my DS. It's a tight vibration and can't tell if it speeds up or down w/ RPM. I just notice it when I am WOT or in fifth at 80 mph not at 75 but it starts at 80. Any sugg.? Clutch?

October 4th, 2009, 06:57 PM	#3
ReverendDexter Devil's Advocate '98 Cobra/'90 GT 'vert Join Date: Jan 2007 Location: Santa Rosa, CA Posts: 3,836	Have you checked your driveshaft->diff bolts? I had a death-rattle that would come on around 55, turned out 3 of mine were loose and one was missing Replaced the lost one and tightened everything up, all was happy. Even if that's not it, I'd get under the car and check for anything lose in the drivetrain. __________________ War is Peace \|\| Freedom is Slavery \|\| Ignorance is Strength Founder of the DMC

October 4th, 2009, 07:36 PM	#5
86er Hardcore Enthusiast Join Date: Nov 2006 Location: Orlando, Fl Posts: 1,394	did you grease up the throw out bearing? If it goes away when the clutch is pressed in, then you have pin pointed the problem, its either the clutch, throw out, or something in your trans possibly. __________________ 1989coupe 419w/c4/2 stages of the smack faster than you faster than your first sexual experience

October 10th, 2009, 11:04 AM	#13
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,026	check your universal joints mine did the exact same thing. the universal joints were shot. Especially if your driveshaft has play in it like your describing. __________________ 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon.

October 13th, 2009, 12:39 AM	#16
flyin ryan Hardcore Enthusiast Join Date: Jun 2008 Location: NJ Posts: 1,176	I would check the balancer and also pull the rear dif cover and look for any cracks. I've blown a factory trac lock before where it wasn't fully blown. It was cracked from one side to the other and made a bunch of vibs from idle to 4500rpms just some ideas, update when you do find the issue i'd like to know __________________ 91 gmc syclone - not stock, money maker 90 lx - turbo, bolts ons etc 88 lx hatch - tons of bolt ons and daily driven 02 zx12r - dyno'd 197 to the wheel http://i44.tinypic.com/2qlws5c.jpg

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October 4th, 2009, 06:52 PM	#2
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	anyone?

October 4th, 2009, 07:00 PM	#4
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	so you think maybe just something loose? I used red loctite on the DS bolts. Definitely check them though.

October 4th, 2009, 09:34 PM	#6
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	Just drove it tonight and noticed that it doesn't seem to do it in 1-3. starts in 4 and gets worse in 5th and mainly w/ more speed. It's like chasing a mouse.

October 6th, 2009, 01:01 AM	#7
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	anyone else?

October 6th, 2009, 01:25 PM	#8
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	So i checked the DS bolts, trans bolts, trans cm bolts, etc. and all are tight. Could my CM bushing be bad? I did not replace it when I did the trans. Also I noticed a little wiggle in my u-joint near the rear. I held the rear diff plate that the bolts go into and tried moving the DS and it wiggled. Any help would be nice b/f i start buying parts to chase a prob.

October 7th, 2009, 12:21 AM	#9
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	surprised that no one has a clue! I'm not surprised I don't!

October 9th, 2009, 10:44 PM	#10
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	Still need help

October 9th, 2009, 11:58 PM	#11
1Fast93GT Newbie 1993 GT Mustang 12.30@119 Join Date: Nov 2007 Location: calvert co. Posts: 13	i doubt your flywheel has any warpage, did you get it turned or buy a new one when you put the new trans in? also, the rear gears may have a chipped tooth or differential fluid is low...other than that, I have no idea.

October 10th, 2009, 12:06 AM	#12
92WhitePNY Newbie 1992 Mustang GT 5.0 Join Date: Oct 2009 Location: Tallahassee FL Posts: 19	Mine does the same above 70 in 4th and 5th. But I think its the cross member bushing. And worn motor mounts don't help. Didnt start till after I remounted my trans from changing my flywheel and clutch.

November 2nd, 2009, 09:27 PM	#19
black89GT Enthusiast 89 gt Hatch How fast can zippie go down? Join Date: Jun 2009 Location: CLEVELAND OHIO Posts: 783	Good stuff man glad it worked out to be pretty easy for you. __________________ Lakewood Uca's/lca's. FMS clutch w/Adj. , Hurst shorty, aluminum d.s. 3.73's Black Stang Crew Co-Founder The blood i bleed is black indeed

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October 11th, 2009, 12:40 PM	#15
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	no to the flex plates. It didn't do it right after the new trans. More like after a few power shifts.

October 13th, 2009, 02:13 PM	#17
86er Hardcore Enthusiast Join Date: Nov 2006 Location: Orlando, Fl Posts: 1,394	i believe he just put a new HB on the car __________________ 1989coupe 419w/c4/2 stages of the smack faster than you faster than your first sexual experience

November 2nd, 2009, 09:25 PM	#18
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	So I finally got around to checking the u-joint's and guess what, that was the problem. One of the rear dust covers failed and ALL the bearings were gone! So I replaced them and will test drive on Wed. Just thought I would let you guys know.

November 7th, 2009, 10:09 PM	#20
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 181	Holy crap! what a difference. Finally drove it today and I guess it's been bad for a while, cuz it has never drove this smooth. Wish I had known sooner.