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Old 05-17-2011, 07:14 PM   #1
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Exclamation 68 Drivability Issues

Hey ya'll. I've got a 68 coupe that i bought about 2 years ago and I have been hard at work ever since. I have replaced the motor, transmission, tires, suspension, interior, and pretty much anything you can replace.... its been done. Except my drive shaft. I have a nasty rolling vibration that starts up around 55 mph and worsens the faster you go... How would i know if the drive shaft is bent or off balance? Is there a test i can do at home without taking it to a machine shop? The car was aligned as soon as the suspension was replaced, but this vibration has been constant since I've owned the vehicle. Any help would be appreciated.... I c ant figure this one out...
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Old 05-17-2011, 07:19 PM   #2
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Re: 68 Drivability Issues

If your drive shaft is bent, you should be able to see damage from something striking it. They usually have little weights welded on them from the factory to balance them... Have you replaced your u-joints? They don't cost much...
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Old 05-17-2011, 07:25 PM   #3
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Re: 68 Drivability Issues

Yes I had a little play in the front U-joint so i replaced them both thinking that they were binding. but the issue is still there... there are weights and it doesn't seem like there is any indication of a weight falling off.... and no noticeable damage...
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Old 05-17-2011, 07:29 PM   #4
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Re: 68 Drivability Issues

I originally thought that the vibration was due to the front end being worn and old. so i replaced everything.... uppers lowers inners outers sleeves steering linkage idler arm. Everything except the Pitman arm. after aligning it, i went for a test drive and its still shook. man i was pissed. all that time and effort, not to mention cash. so thats why i am left to believe that the problem has to do with the drive shaft or possibly the rear end?
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Old 05-17-2011, 07:50 PM   #5
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Re: 68 Drivability Issues

Wow, you must be really frustrated after all that work... When I was young, I shortened a drive shaft and did a half assed job and it vibrated at about 50 and got worse with speed. Tire and wheel issues usually happen at a higher speed, 65 to 70.... You might be on the right track...

Here's a suggestion... Put your rear axle on jack stands with you tires in the air, put the car in neutral, after blocking the front tires and have some one spin a wheel and crawl under and observe your drive shaft spinning... Shake it, see if it is loose in any way.... Just a thought, but do it safely...
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Old 05-17-2011, 07:53 PM   #6
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Re: 68 Drivability Issues

Thats an absolutely outstanding idea! never even though of it... maybe I'll Run a dial indicator on it to see if its bent too... maybe its a long bend not a small dent making it out of balance... You seem knowledgeable, how much would a new drive shaft cost me, any ideas on what they run? ( just in case it really is destroyed )
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Old 05-17-2011, 08:38 PM   #7
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Re: 68 Drivability Issues

Dial indicator is an excellent idea...

Not sure, aftermarket are probably available for $250 or so.... I actually have been into the new Stangs for the past few years and haven't been paying attention to the vintage stuff although I did own two 64 1/2's and one 65...
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05 GT Mustang, FRPP, FR X pipe, Hurst short throw,
American Racing Torque Thrust 10X20 wheels,
Granettelli tower brace, custom painted flat black grafix, Yellow Optima
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