bad vibration

[Pat]

In the for what it's worth dept., I had a bad vibration in Old Rusty, turned out to be a plug wire that had came off. Mainly noticed on acceleration, worse with moderate to heavy acceleration. Just throwing a guess out.

[BenM]

I was looking through the manual again, maybe transfer case output, like others have said, or inside the rear axle. Have you changed the gear oil in the rear axle?

My only other thought is pinion angle. The engine and the rear axle aren't shifted, or have bad mounts? And there are no blocks on the rear springs to affect pinion angle?

[pigonawing]

i've added air shocks to lift it but it did not vibrate before this last tranny repair

[BenM]

Just adding air shocks shouldn't affect it. I mentioned blocks because they are sometimes angled and that affects things much more.

[shanebo]

Hey Pigonawing,

 I just bought an 81 sx4 4 spd and it does the exact same thing but at around 70-75....all I can compare it to is like driving over those rumble strips but x3...the dash shakes pretty bad and its pretty loud....Its wierd cuz it drives perfect at 65 and under. Ill be following this thread real close now in hope both of us can get some resolve.

[carnuck]

Sometimes you lift these (or any) rigs and the ujoint goes out of it's spot where it's worn in and causes vibes. I'd recheck the U-joint bolts and if it didn't vibe before the trans change, make sure everything else is tight too. If you have taken apart the rear driveshaft, it may have been reassembled wrong.

[captspillane]

Eagles are prone to a harmonic vibration that is worse at several specific speeds, then decreases as you go faster or slower. If your Eagle can drive completely vibration free before and after the shaking occurs, its likely that issue. The other common causes of vibration are present at all speeds.

Replace your steering stabilizer first. That's the shock looking thing in the front of the car. Its cheap and easy to do. Its considerably more important in an Eagle than any other type of vehicle.

[ozarkrebel]

BE SAFE!!!!!  When you have a vibration the safest thing to do is check out all parts, especially when it comes to your steering components. Even if you find one part is bad (ball joint, tie rod end, steering stabilizer, etc.) go ahead and check the other parts as well, you may just find other parts are wore just as bad, which is usually the case. Replacing one part to see if the vibration goes away and ignoring the rest is just plain ignorance. You are gambling not only on your own safety, but you passengers and everybody else who happens to be in your path when a steering part lets go.