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Old 02-19-2009, 01:32 PM
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vibration after lowering rear suspension

Hello,

I have a 67 camaro that has been lowered. the rear has a 1" block and some extra weight in the rear of the car from a stereo system. It is effectively lowered 2". The car was equipped with multi leef springs before i purchased it. Since it has been lowered i have developed a vibration mainly when i back off the throttle while cruising 60mph-80mph. You can here it as well as feel it. If i maintain speed it doesn't seem to vibrate much but probably not as smooth as I would like. Again only at speed. Is my pinion angle off or do I possibly have something wrong with the rear end? Let me know if you need any more information.
Thanks
Ron

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Old 02-19-2009, 02:11 PM
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I would suspect the pinion angle has been altered by the lowering. measure the pinion angle with the blocks in,then take the blocks out, and measure the pinion angle that was stock while the chassis is loaded(weight on chassis) and see if there is a difference from the lowered pinion angle. a simple sears magnetic angle finder will suffice for this. if the angle is changed by more than @2degrees, you can angle cut the lowering block (on the side that has the hole that the spring center bolt fits into!) and this should solve your problem!
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Old 02-19-2009, 05:24 PM
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Don't take everything apart just yet. Put the car on a level surface and check to see if the transmission output shaft angle is the same as the pinion angle. I would say pinion angle should be -1 or so to +1 from the output shaft angle.Remember the pinion angle will rise as long as the tires are rotating. Also check to make sure that the blocks are tight and the blocks are seated against the springs and the axle mounts.

60-80 miles an hour is a huge frequency range so it should be easy to spot the problem. Also check to make sure the axle isn't slightly cocked under the car.
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Old 02-20-2009, 12:15 PM
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thanks

thanks for the input, so what i am gathering is that the pinion angle should match the trans ouput shaft give or take 2% with the suspension totally compressed by the cars weight? How do you measure this? I have heard of the angle finder way but where do you place the finder. Thanks again
Ron
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Old 02-20-2009, 01:45 PM
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You can put it on the yolks by the U-joints or you can use a plumb bob and a protractor.
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Old 02-20-2009, 05:10 PM
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for even more info,remember to search the hotrodders bulletin board "search" on "pinion angle"
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Old 02-20-2009, 06:44 PM
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thanks

Thanks again, i will have a look.
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