high speed vibration??

F8L GT · March 23rd, 2009, 01:18 AM

OK guys tell me what you think, Last month I converted my rear end to 31 spline. Consists of 31 spline Moser axles, FRPP 31 spline T-Loc, FRPP 4:10 gears. Last week was when I got to finally drive the car. I have a Vibration that starts at around 65. It feels like a fine vibrations like pinion angle. Pinion angle and driveshaft angle check out good and the u-joints are fine. I had taken the steel dampener off. I put it back on and the Vibration was a little better. By guess is that its the driveshaft. In the Ford Service manual it says to mark the drive shaft and the flange so you can line them back up for balance reasons. I however did not do that. Anyone have any input?

ajm · March 23rd, 2009, 01:20 AM

ive heard that if you dont mark and line it back up youll be ok; then again if thats the case why would ford bother to say its necessary? and thats just what ive "heard"/read/seen posted by a few people

I really dont have any ideas for you

John's_stang · March 23rd, 2009, 01:21 AM

maybe need an alignment? or balance? lol idk

F8L GT · March 23rd, 2009, 01:24 AM

I ruled out the tires because i swapped them and its still there. ALignment is fine. If someone lived around me with and aluminum drive shaft i woudl try that but... no one does

ajm · March 23rd, 2009, 01:25 AM

Since you didnt mark it to realign it to begin with maybe try turning it 90* or whatever to where its aligned in a different position just to see if it gets better/worse. Sounds a little goofy but hell its worth a try considering the amount of time involved in doing it.

John's_stang · March 23rd, 2009, 01:27 AM

Originally Posted by ajm

Since you didnt mark it to realign it to begin with maybe try turning it 90* or whatever to where its aligned in a different position just to see if it gets better/worse.

F8L GT · March 23rd, 2009, 01:30 AM

thats what i was going to try next. the driveshaft and flange both had yellow paint marks on them and i lined them up. I just hope one of my axle flanges doesnt have a little run out to it.

ajm · March 23rd, 2009, 01:31 AM

That crossed my mind too but I didnt think much of it considering you bought them new (i think) but you never know stuff happens. I guess that would be the next thing to check after the driveshaft. Id image if you got the yellow mark lined up though you should be good.

F8L GT · March 23rd, 2009, 01:37 AM

that what i thought, and another thing that leads me to the ds is because i bolted the dampner back on it got better.

ajm · March 23rd, 2009, 01:38 AM

thats pretty weird, it makes sense the dampner cut down the vibration though

mrsinister2424 · March 23rd, 2009, 01:58 AM

Actually I've heard tons of people getting bad vibration problems after doing gears. The remedy was a new driveshaft. I've heard this on threads and from people I've met time and time again.

F8L GT · March 23rd, 2009, 02:04 AM

thats what im hoping is that its the driveshaft and that an aluminum one will fix it

mrsinister2424 · March 23rd, 2009, 02:06 AM

Sounds like that's the problem. I'd probably go with that.

SilverFreakGT · March 23rd, 2009, 02:42 AM

my car had a vibration like that at high speeds, (more like 90 plus) and it turned out one of the bolts on the transmission mount had striped the threads inside the bellhousing so it was just loose inside. Put a nut on the other side with a longer bolt to solve that little problem. =)

DickH · March 23rd, 2009, 02:46 AM

Well the alu drive shaft is an awesome idea, but just to cover something else, what are the odds that one of the axles is just slightly warped or something, causing the vibration?

F8L GT · March 23rd, 2009, 02:54 AM

since they are brand new i hope the odds are very unlikely, but you never know. Im not saying the drive shaft would cover it up, im saying that it might be the problem

mustang_gtr_99 · March 23rd, 2009, 02:56 AM

my wifes 04 6er did it at about 65 when one of her tires was off allance????

F8L GT · March 23rd, 2009, 02:57 AM

swapped out all the tires, i was hoping maybe i threw a weight off one of the new wheels in the back but that wasnt it

mustang_gtr_99 · March 23rd, 2009, 02:59 AM

they balanced it with the new tires on? It was wiered to because it started at 65 and smoothed out at about 70. Just enough to be anoying

F8L GT · March 23rd, 2009, 03:01 AM

i mean i swapped them out to my old ones and its still there. so its not the tires or wheel issue

March 23rd, 2009, 01:18 AM	#1
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	high speed vibration?? OK guys tell me what you think, Last month I converted my rear end to 31 spline. Consists of 31 spline Moser axles, FRPP 31 spline T-Loc, FRPP 4:10 gears. Last week was when I got to finally drive the car. I have a Vibration that starts at around 65. It feels like a fine vibrations like pinion angle. Pinion angle and driveshaft angle check out good and the u-joints are fine. I had taken the steel dampener off. I put it back on and the Vibration was a little better. By guess is that its the driveshaft. In the Ford Service manual it says to mark the drive shaft and the flange so you can line them back up for balance reasons. I however did not do that. Anyone have any input? __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

March 23rd, 2009, 01:24 AM	#4
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	I ruled out the tires because i swapped them and its still there. ALignment is fine. If someone lived around me with and aluminum drive shaft i woudl try that but... no one does __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

March 23rd, 2009, 01:30 AM	#7
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	thats what i was going to try next. the driveshaft and flange both had yellow paint marks on them and i lined them up. I just hope one of my axle flanges doesnt have a little run out to it. __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

March 23rd, 2009, 01:37 AM	#9
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	that what i thought, and another thing that leads me to the ds is because i bolted the dampner back on it got better. __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

March 23rd, 2009, 01:58 AM	#11
mrsinister2424 Hardcore Enthusiast 99' Mustang GT 3214@OVER 9000!!! Join Date: Dec 2008 Location: Redlands, CA Posts: 2,626 iTrader: 0 reviews	Actually I've heard tons of people getting bad vibration problems after doing gears. The remedy was a new driveshaft. I've heard this on threads and from people I've met time and time again. __________________ 99' Rio Red Mustang GT: --My Garage-- Check garage. Vortech V-1 intercooled running 9lbs of boost Life= eat, lift, eat, eat, eat, sleep, repeat

March 23rd, 2009, 01:20 AM	#2
ajm Banned Join Date: May 2008 Posts: 7,970 iTrader: 4 reviews	ive heard that if you dont mark and line it back up youll be ok; then again if thats the case why would ford bother to say its necessary? and thats just what ive "heard"/read/seen posted by a few people I really dont have any ideas for you

March 23rd, 2009, 01:21 AM	#3
John's_stang Regular Join Date: Aug 2008 Posts: 238 iTrader: 0 reviews	maybe need an alignment? or balance? lol idk

March 23rd, 2009, 01:25 AM	#5
ajm Banned Join Date: May 2008 Posts: 7,970 iTrader: 4 reviews	Since you didnt mark it to realign it to begin with maybe try turning it 90* or whatever to where its aligned in a different position just to see if it gets better/worse. Sounds a little goofy but hell its worth a try considering the amount of time involved in doing it.

March 23rd, 2009, 01:31 AM	#8
ajm Banned Join Date: May 2008 Posts: 7,970 iTrader: 4 reviews	That crossed my mind too but I didnt think much of it considering you bought them new (i think) but you never know stuff happens. I guess that would be the next thing to check after the driveshaft. Id image if you got the yellow mark lined up though you should be good.

March 23rd, 2009, 01:38 AM	#10
ajm Banned Join Date: May 2008 Posts: 7,970 iTrader: 4 reviews	thats pretty weird, it makes sense the dampner cut down the vibration though

March 23rd, 2009, 02:04 AM	#12
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	thats what im hoping is that its the driveshaft and that an aluminum one will fix it __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

March 23rd, 2009, 02:06 AM	#13
mrsinister2424 Hardcore Enthusiast 99' Mustang GT 3214@OVER 9000!!! Join Date: Dec 2008 Location: Redlands, CA Posts: 2,626 iTrader: 0 reviews	Sounds like that's the problem. I'd probably go with that. __________________ 99' Rio Red Mustang GT: --My Garage-- Check garage. Vortech V-1 intercooled running 9lbs of boost Life= eat, lift, eat, eat, eat, sleep, repeat

March 23rd, 2009, 02:42 AM	#14
SilverFreakGT Regular 2000 Mustang GT not yet captured Join Date: Nov 2008 Location: Orange County Posts: 176 iTrader: 0 reviews	my car had a vibration like that at high speeds, (more like 90 plus) and it turned out one of the bolts on the transmission mount had striped the threads inside the bellhousing so it was just loose inside. Put a nut on the other side with a longer bolt to solve that little problem. =) __________________ 2000 Mustang GT Silver on charcoal MMR Coilover kit, FRPP 4:10's, SCT box tune, FRPP King Cobra Clutch, Steeda quick release quadrant on FRPP cable, MGW shifter, K/N cold air intake, Flowmaster exhaust [SIGPIC]

March 23rd, 2009, 02:46 AM	#15
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 3,948 iTrader: 2 reviews	Well the alu drive shaft is an awesome idea, but just to cover something else, what are the odds that one of the axles is just slightly warped or something, causing the vibration? __________________ Before asking a gearing related question click THIS link and enjoy all your saved time. Click here for your tuning needs My slow paced budget 5.4 dohc build

March 23rd, 2009, 02:54 AM	#16
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	since they are brand new i hope the odds are very unlikely, but you never know. Im not saying the drive shaft would cover it up, im saying that it might be the problem __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

March 23rd, 2009, 02:56 AM	#17
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	my wifes 04 6er did it at about 65 when one of her tires was off allance???? __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 23rd, 2009, 02:57 AM	#18
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	swapped out all the tires, i was hoping maybe i threw a weight off one of the new wheels in the back but that wasnt it __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

March 23rd, 2009, 02:59 AM	#19
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	they balanced it with the new tires on? It was wiered to because it started at 65 and smoothed out at about 70. Just enough to be anoying __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 23rd, 2009, 03:01 AM	#20
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,064 iTrader: 13 reviews	i mean i swapped them out to my old ones and its still there. so its not the tires or wheel issue __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ Custom Race Transmission Build

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