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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering> shimmy in suspension
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Topic Review (Newest First)
04-29-2010 08:59 PM
ericnova72
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??
04-29-2010 03:47 PM
eloc431962 Did you change the angle (pinion)of the rearend at all during the changes you made?


Cole
04-29-2010 12:24 PM
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?
04-29-2010 06:51 AM
cucumber1949 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.
04-29-2010 06:22 AM
elcaminoman69 no only when i slow down. i put the transmision in neutral and it still did it.
04-28-2010 03:32 PM
eloc431962 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
04-28-2010 03:00 PM
elcaminoman69
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.

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