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

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

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

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?

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.

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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"

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.

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

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.

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

66fastback-

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

I love learning!

Take care,
-Chris

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Retired Moderator
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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.

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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"