I have a problem, I recently replaced the rear of my 1990 camaro, the lca was bent , when I went to put back the lca the bolt did not go through, I found a skinnier bolt and it fit through. when I am perfectly still and I do a burnout no shaking, when I start to drive I feel a vibration. could it be the lca?? what should I look for?

 

I doubt it. But you have a dangerous time bomb there, just waiting for the perfect opportunity to turn your car into an unguided missile. I'm glad I live on the opposit coast.

Go to the junkyard and spend $5 and get a non-defective LCA.

Your vibe is probably a separated tire or bent wheel or axle, most likely a tire. That's the usual cause.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I thought it was the tire too so I got them ballaced, no diffrence. how can I tell if the axle is bent??

 

Put the rear of the car up on jack stands and CAREFULLY start the engine and put the tranny in drive. Look at the tires as they are spinning. If there is a wobble in a wheel then the axle is most likely bent.
bsa