Bad Vibrations

68302 · 10-21-2001, 08:22 PM

Ever since i owned my 68 stang, there was a big vibration coming from the rear and it makes its way thruogh the steering column and seats. I especially feel it around 40-50 mph.Could it be worn gears,bearings? Please help. It just seems to be getting worse. Thanks

stretchx1 · 10-22-2001, 05:01 AM

It can be a lot of things #1 check the input shaft on rear end #2 weel bearings on both sides #3 check the drive shaft it can be bent or out of ballance There is more just start there

Gearhead999 · 10-22-2001, 07:40 PM

I agree can be anyone of those problems. But, first check the tires.

zach0 · 10-23-2001, 09:04 AM

I had a problem similar but at thirty mph. The U-Joint was a little off center on the rear and when I tried to accelerate it would shake and when I let off the cas it would stop. Tires Balanced?

66fastback · 10-24-2001, 09:10 AM

I agree, tires are the quickest and easiest to check. BUT.......I have a question, is this an automatic trans? The reason I ask, is my drive shaft is the cause of a lot of vibration also (it came from a 67 auto car), and I have recently found out that Ford lined the inside of the auto drive shafts with rubber back then to absorb vibration. All well and good back in the 60's, but now that same rubber that made for a smoother ride back then has hardened and cracked and can be loose enough to CAUSE a vibration now.
Good luck.

------------------
66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"

mustangman65_79 · 10-27-2001, 04:25 AM

another thing to check is the u joints, I've had simular problems with a ranger. this is easy to check somethimes. Just go under your car and see if u can move the driveline around the u-joint area-like up and down motion. Another way to trouble shoot is to put the rear end up on jack stands and drive it like u would, have a friend watch to see what shakes at that speed.

------------------
66' Mustang 2bbl 289 coupe, stock.
79' Mustang soon to be a 302-selling-
89' Bronco 351w
AIRMEN FIRST CLASS
KASPAR T. HOWE

diablopony · 10-27-2001, 08:36 AM

I also had the same vibration problem. The rubber in my driveshaft was all cracked and corroded. I had it balanced a few times and that helped temporarly. I finally gave in and bought an aluminum driveshaft.

Expensive, but solves the problem.

------------------
'68 convert, 289, C-4, Edelbrock Performer package, Tri-Y headers, 3.25 rear gears

PKRWUD · 10-31-2001, 04:39 AM

66fastback-

That's great info! Thanks! I never knew that. What years does that apply to?

I love learning!

Take care,
-Chris

------------------
Retired Moderator
MustangNet

My site: Peckerwoods Pit Stop

My teams site: Jim Porter Racing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

66fastback · 10-31-2001, 12:42 PM

wish I could tell you for sure....just know that Ford did this during the 60's with the automatic equipped cars....I never would have dreamed there was even a difference between driveshafts on auto or stick shift cars.

Sure explains why so many of these cars have drivetrain vibrations now though.

------------------
66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"

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10-21-2001, 08:22 PM	#1
68302 Registered Member Join Date: Oct 2001 Location: Panama City, Florida Posts: 14	Bad Vibrations Ever since i owned my 68 stang, there was a big vibration coming from the rear and it makes its way thruogh the steering column and seats. I especially feel it around 40-50 mph.Could it be worn gears,bearings? Please help. It just seems to be getting worse. Thanks

10-22-2001, 05:01 AM	#2
stretchx1 Registered Member Join Date: Apr 2000 Location: kc,kansas,johnson Posts: 30	It can be a lot of things #1 check the input shaft on rear end #2 weel bearings on both sides #3 check the drive shaft it can be bent or out of ballance There is more just start there

10-22-2001, 07:40 PM	#3
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	I agree can be anyone of those problems. But, first check the tires.

10-23-2001, 09:04 AM	#4
zach0 Registered Member Join Date: Apr 2001 Location: Hampton, Virginia Posts: 227	I had a problem similar but at thirty mph. The U-Joint was a little off center on the rear and when I tried to accelerate it would shake and when I let off the cas it would stop. Tires Balanced?

10-24-2001, 09:10 AM	#5
66fastback Registered Member Join Date: Mar 1999 Location: Dallas, TX Posts: 208	I agree, tires are the quickest and easiest to check. BUT.......I have a question, is this an automatic trans? The reason I ask, is my drive shaft is the cause of a lot of vibration also (it came from a 67 auto car), and I have recently found out that Ford lined the inside of the auto drive shafts with rubber back then to absorb vibration. All well and good back in the 60's, but now that same rubber that made for a smoother ride back then has hardened and cracked and can be loose enough to CAUSE a vibration now. Good luck. ------------------ 66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"

10-27-2001, 04:25 AM	#6
mustangman65_79 My poor 79 RIP Join Date: Oct 2001 Location: Suisun City, Posts: 2,320	another thing to check is the u joints, I've had simular problems with a ranger. this is easy to check somethimes. Just go under your car and see if u can move the driveline around the u-joint area-like up and down motion. Another way to trouble shoot is to put the rear end up on jack stands and drive it like u would, have a friend watch to see what shakes at that speed. ------------------ 66' Mustang 2bbl 289 coupe, stock. 79' Mustang soon to be a 302-selling- 89' Bronco 351w AIRMEN FIRST CLASS KASPAR T. HOWE

10-27-2001, 08:36 AM	#7
diablopony Registered Member Join Date: Jan 2001 Location: Clayton, CA USA Posts: 116	I also had the same vibration problem. The rubber in my driveshaft was all cracked and corroded. I had it balanced a few times and that helped temporarly. I finally gave in and bought an aluminum driveshaft. Expensive, but solves the problem. ------------------ '68 convert, 289, C-4, Edelbrock Performer package, Tri-Y headers, 3.25 rear gears

10-31-2001, 04:39 AM	#8
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	66fastback- That's great info! Thanks! I never knew that. What years does that apply to? I love learning! Take care, -Chris ------------------ Retired Moderator MustangNet My site: Peckerwoods Pit Stop My teams site: Jim Porter Racing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

10-31-2001, 12:42 PM	#9
66fastback Registered Member Join Date: Mar 1999 Location: Dallas, TX Posts: 208	wish I could tell you for sure....just know that Ford did this during the 60's with the automatic equipped cars....I never would have dreamed there was even a difference between driveshafts on auto or stick shift cars. Sure explains why so many of these cars have drivetrain vibrations now though. ------------------ 66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"