Vibration in drivetrain

jamilla · October 3rd, 2009, 07:09 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, 05:52 PM

anyone?

ReverendDexter · October 4th, 2009, 05:57 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, 06:00 PM

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

86er · October 4th, 2009, 06:36 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, 08:34 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, 12:01 AM

anyone else?

jamilla · October 6th, 2009, 12:25 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 6th, 2009, 11:21 PM

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

jamilla · October 9th, 2009, 09:44 PM

Still need help

1Fast93GT · October 9th, 2009, 10:58 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 9th, 2009, 11:06 PM

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, 10:04 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, 06:20 PM

did you swap flexplates?

jamilla · October 11th, 2009, 11:40 AM

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 12th, 2009, 11:39 PM

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, 01:13 PM

i believe he just put a new HB on the car

jamilla · November 2nd, 2009, 08:25 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.

sickfox · November 2nd, 2009, 08:27 PM

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

jamilla · November 7th, 2009, 09:09 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, 07:09 PM	#1
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	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, 05:57 PM	#3
ReverendDexter Priest of the Car Gods Clapped-out '90 GT 'vert ~5.5 seconds off TTOD :( Join Date: Jan 2007 Location: Rohnert Park, CA Posts: 13,808 iTrader: 0 reviews	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. __________________ O o /¯/______________________ \|BLAAAAAAAAAAAAAAAAAAAAAAAAARGH!!! \_\

October 4th, 2009, 06:36 PM	#5
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	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. __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

October 10th, 2009, 10:04 AM	#13
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,075 iTrader: 0 reviews	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 10th, 2009, 06:20 PM	#14
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	did you swap flexplates? __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

October 4th, 2009, 05:52 PM	#2
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	anyone?

October 4th, 2009, 06:00 PM	#4
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	so you think maybe just something loose? I used red loctite on the DS bolts. Definitely check them though.

October 4th, 2009, 08:34 PM	#6
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	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, 12:01 AM	#7
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	anyone else?

October 6th, 2009, 12:25 PM	#8
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	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 6th, 2009, 11:21 PM	#9
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	surprised that no one has a clue! I'm not surprised I don't!

October 9th, 2009, 09:44 PM	#10
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	Still need help

October 9th, 2009, 10:58 PM	#11
1Fast93GT Newbie 1993 GT Mustang 12.30@119 Join Date: Nov 2007 Location: calvert co. Posts: 13 iTrader: 0 reviews	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 9th, 2009, 11:06 PM	#12
92WhitePNY Newbie 1992 Mustang GT 5.0 Join Date: Oct 2009 Location: Tallahassee FL Posts: 19 iTrader: 0 reviews	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.

October 11th, 2009, 11:40 AM	#15
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	no to the flex plates. It didn't do it right after the new trans. More like after a few power shifts.

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October 12th, 2009, 11:39 PM	#16
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	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

October 13th, 2009, 01:13 PM	#17
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	i believe he just put a new HB on the car __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

November 2nd, 2009, 08:25 PM	#18
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	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, 09:09 PM	#20
jamilla Regular 89' LX Conv. 12.8@113 Join Date: Jun 2008 Posts: 236 iTrader: 0 reviews	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.

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