I'm am about ready to put the car up for sale, or ram it into a guardrail or something.

It vibrates like a cheap hotel bed at freeway speeds. When i got it, it did it a little, but wasn't terrible so no biggie. Over the last 6 months it has been getting progresivly worse to the point now, you get up to 70mph and it starts shaking violently. SLow down, goes away, speed up comes back.

I had a new driveshaft, yokes & u joints installed & full rear end rebuild last week- No change at all (maybe a little smoother at slow speeds) and a lot lighter in my wallet. :mad:
Yesterday- I pulled the tires rims off my elcamino and put them on it- no change at all. :mad: :mad:

WHAT ELSE CAN CAUSE THIS???? :confused: :confused: :confused:

I know the front end bushings and stuff is worn- and i have a new PST kit i've been planning to put in... but at $800 to install it if those parts AREN'T causing this problem i don't want to spend the money on it....

HELP! I don't want to take it to anymore shops that are sure that *THIS* $1000+ dolar fix will solve the problem, just to have them say afterwords that it must be your tires/rims causing it. :mad: graemlins/clonk.gif

This car is my girlfriends daily driver and it has to be driveable, I can't take it apart for a month to dick aroud with it... and i can't afford to keep taking to places and not solving the problem.

Broken trans/engine mount(s), driveshaft angles (rear diff angle should be 2-4 degrees "down" (starting point)as compared to the angle of the trans output shaft). This is where I'd start if you've done the other things.

Jody

Be sure to check your motor and trans mounts as suggested above. I had a similar problem a few years ago. Mine turned out to be a bad yoke but I wasn't sure if the problem was my front end or front wheel bearings. So, I put my rear end on jackstands then started the car, put it in gear, then ran it up to 70mph to see if the vibration still occured which it did. This eliminated the front end as any possible cause. THIS IS VERY DANGEROUS SO BE SURE YOU ARE IN THE CAR WITH YOUR FOOT READY TO HIT THE BRAKE IN CASE IT COMES OF THE JACKSTANDS. GIVE PLENTY OF ROOM IN FRONT SO YOU DON'T HIT ANYTHING OR ANYONE. If you try this and the vibration still occurs then try to eliminate the engine or tranny by driving the car up to speed and put it in neutral to see if it still vibrates. If so then it has to be the driveshaft on back.

I had a similar problem, it was the flex plate , you might want to check it out. I replaced it with the correct one and no more vibration. good luck...Zuma

How about worn out shocks? Every now and then I see a car going down the road and will see one of its wheels jumping up and down terribly. I could then notice his stearing wheel was shaking just as bad from the vibration.

What kind of shape is the rest of the front end in - ball joints, tie rod ends, idler arm, pitman arm, control arm bushings, shocks, etc.? If enough of that stuff is worn beyond limits, the cumulative effect can be like a tank-slapper on a bike. Where do you feel it the most - in the steering wheel and front end, or in the seat of your pants?
graemlins/beers.gif

My driveline vibration was from a bent rim, out of round tire and cracked harmonic balancer.

check the tires too, to see if there is any unusual wear patterns. a wheel balance weight may have fallen off or slipped and the tire became out of balance and as the tire wears out of balance the vibration will become worse. had a truck tire that was 1/2 pound (not oz.) out of balance after the weight fell off and i kept driving it. add centrigugal force and that can turn into hundreds of pounds at highway speeds.

check little things too like missing torque converter or flywheel bolts.

good luck and take her anywhere she needs for now. don't let her drive it till it's safe. get her a rental, whatever, just play it safe. she'll love ya even more for knowing you care, and she'll be around to show it.

I know you said you had a full rear end rebuild, but have you checked the axles for runout?

I had same problem!
It was the front rotors which where not balanced.
and rear drums were missing the weights as well.
seems that the previous owner bought new rotors and drums and never thought that they needed balancing.
Also check the driveshaft for proper balancing aswell.

turns out it was the rims afterall.

When i tested it yesterday morning, i only put on the front rims off the elky thinking the vibe was coming from the front.

For kicks i decided to stick the rear ones on also- Problem went away completly...

So... Time for new rims & tires.

Thanks- Sorry for sounding so bent out of shape...

Ben

I've always had good luck taking wheels/tires to be mounted to a shop that has a Hunter GSP-9700 balancer; it also checks/diagnoses for radial and lateral runout, and for radial force variation, which is independent of any balance issues. With a trained tech, that machine suggests cures that make any other balancer obsolete. If you go to www.GSP9700.com (http://www.GSP9700.com) , there's a locator there that will tell you the closest shops to you that have one. I live in a small town in a rural area, and both the Chevy and Chrysler dealers have them.
graemlins/beers.gif

Originally posted by AHSOM70:
turns out it was the rims afterall.


Thanks- Sorry for sounding so bent out of shape...

Ben Pun intended? tongue.gif