69 nova has a front end shimmy over 50mph - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-27-2004, 03:38 PM
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69 nova has a front end shimmy over 50mph

I've read all the related posts regarding this subject and I don't think any of them are what's happening to my car. It's a 69 nova 350 4spd. The driveshaft and rear are original to the car. I have an annoying shake/shimmy in the front end and through the wheel whenever the car gets above 55 mph. It smooths out a bit over 65 but it's still there. When I pull the car out of 4th gear and the rpms drop to idle the shake stays exactly the same which leads me to believe it's not anything in the engine/balancer/bellhousing.

The things I've done/checked.
-The front suspension has been completely rebuilt over the past 5 years.
-brand new tires and steel wheels, balanced.
-flipped driveshaft 180.
-aligned front end.
-double and triple checked that nothing was hitting or rubbing.
-just replaced the pitman arm (was 1/4" longer than previous unit) readjusted toe.

While I've been chasing this shake, I've developed a pull when I apply the brakes as well. Related?

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Old 09-27-2004, 07:50 PM
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I've seen too many cases where someone assumes that since they've replaced a part and the problem is not corrected, then the problem must lie elsewhere. Now normally that would be true, but you said the front suspension has been rebuilt over a 5-year period. I don't know how many miles you've put on it over that time frame, but parts could have worn out or have been substandard in the first place. You're right, since the shaking isn't RPM-dependent, than you have to look for something other than the engine/transmission.

I'd definitely start by looking at the U-joints, and then move on to the alignment, tire balance and worn front end parts (especially ball joints and/or steering linkage). Is the car driven regularly or does it sit for periods of time. If it tends to stay parked for a while, it possible the tires have become flat-spotted and replacement is your only option. (This probably wouldn't be something the average tire-shop 'tech' would catch.)
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Old 09-27-2004, 08:21 PM
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the car has around 10,000 miles since I started rebuilding the front end, the tires are also brand new, less than 20 miles. I will double check the u-joints. thanks for your reply
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Old 09-27-2004, 09:55 PM
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One other idea for you is to rotate your tires front to back. If the vibration changes you have a tire or rim issue.
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