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-   Suspension - Brakes - Steering (http://www.hotrodders.com/forum/suspension-brakes-steering/)
-   -   shimmy in suspension (http://www.hotrodders.com/forum/shimmy-suspension-177047.html)

elcaminoman69 04-28-2010 03:00 PM

shimmy in suspension
 
i have just restently built a 1979 elcamino and i put a whole new suspension and drive train in it. i built ladder bars and put coil over shocks on it. the problem is when im slowin down i can feel a bad vibration threw the steerin wheel and the floor. and i even put it into nutral and it still did it. i dont know where it could be comin from. i have a posi diff. in it also.

eloc431962 04-28-2010 03:32 PM

And you only feel it when you are slowing down that's it? You don't feel it when you are taking off at all?


Cole

elcaminoman69 04-29-2010 06:22 AM

no only when i slow down. i put the transmision in neutral and it still did it.

cucumber1949 04-29-2010 06:51 AM

Having some past experience with something similar, I would look at the front end alignment first. Had a car which did this when I was decelerating. The caster was more negative than it should have been, so when the weight transferred to the front end because of the deceleration, that was enough to start an oscillation due to not enough caster. Also, incorrect toe setting could start a sequence of events that would be similar to what you are seeing.

elcaminoman69 04-29-2010 12:24 PM

well i didnt do any thing to the front end only the rear suspension. when i took the car apart it never did it. but the back end of the car sits higher now so could that maybe affect the caster?

eloc431962 04-29-2010 03:47 PM

Did you change the angle (pinion)of the rearend at all during the changes you made?


Cole

ericnova72 04-29-2010 08:59 PM

Quote:

Originally Posted by elcaminoman69
well i didnt do any thing to the front end only the rear suspension. when i took the car apart it never did it. but the back end of the car sits higher now so could that maybe affect the caster?

Yes, it will. So will worn front end parts combined with new tight rear suspension parts.

Could also be a driveshft vibe from the pinion angle being wrong as Cole has suggested. Did you verify the angle when you swapped to the ladder bar suspension??

What ladder bars did you use ?? The bolt-on ones sold by Lakewood and Competition Engineering that also bolt to the stock suspension and housing( these are terrible for traction by the way, all they do is bind up the suspension so it can't move) or Full on Drag chassis ladder bars??


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