Rear leaf spring issues? Or axle issues? Help!!!!! - Team Camaro Tech
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post #1 of 9 (permalink) Old Dec 24th, 11, 12:47 AM Thread Starter
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Exclamation Rear leaf spring issues? Or axle issues? Help!!!!!

I'm having issues with my rear leaf springs or the rear axle? Not quite sure but when I step on it on first gear it makes a very loud tumbling noise in the rearaxle or leaf springs for a little bit then it stops . What do u guys think this is ? And how can I fix this ?
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post #2 of 9 (permalink) Old Dec 24th, 11, 05:12 AM
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Re: Rear leaf spring issues? or axle issues? Help!!!!!

Don't step so hard on the gas pedal - learn to ease away from the stop, no jack rabbit starts.
Too much torque - detune the engine or change rear axle ratio to a lower numerical ratio.
Along with above statements - no 5000 RPM dump the clutch launches.
Add a traction device to the rear axle - many designs to chose.
May need to change rear springs, if you have a single leaf spring.
If tumbling is believed coming from the rear axle, and especially noticable during a turn, you may need to replacve the axle lube oil and add a new bottle of GM posi additive, then exercise the rear axle by making figure-8's in a safe place to lube the clutch plates, if you have a limited slip axle.

We need more info on the car as to how it is equipped and also being operated during time of tumbling.

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post #3 of 9 (permalink) Old Dec 24th, 11, 05:36 AM
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Re: Rear leaf spring issues? or axle issues? Help!!!!!

It could be the rear axle or leaf spring bumping against the exhaust pipe(s) when accelerating.

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post #4 of 9 (permalink) Old Dec 24th, 11, 02:38 PM Thread Starter
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Re: Rear leaf spring issues? or axle issues? Help!!!!!

It's a 327 sb 4 speed, the leaf springs and axle seem to be stock. But it does seem to jump like a rabbit when I step on it for a bit.
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post #5 of 9 (permalink) Old Dec 24th, 11, 02:40 PM Thread Starter
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Re: Rear leaf spring issues? or axle issues? Help!!!!!

It's jumps as well on turns when I step on it.
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post #6 of 9 (permalink) Old Dec 24th, 11, 08:12 PM
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Re: Rear leaf spring issues? or axle issues? Help!!!!!

It's called axle wrap or spring wrap. When you step on it, the torque produced wants to rotate the pinion upwards. This torque will overcome the leaf spring and and sort of wrap it into an S shape. The tumbling you feel is the leaf spring wrapping then snapping back into shape repeatedly.

You need a traction device but, first make sure the leaf spring pack clamps are snug at least from the axle tube forward as a loose or sloppy spring pack will wrap easily.

You'd do well to lay off the hard starts till you get the spring wrap under control, cause you can break stuff that way.
or
Maybe it's posi rear chatter. Do you have a posi unit in the rear?

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post #7 of 9 (permalink) Old Dec 25th, 11, 05:54 AM
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If it is really loud it could be the yoke hitting the floor board when the axle wraps.


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post #8 of 9 (permalink) Old Dec 25th, 11, 09:05 AM
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Re: Rear leaf spring issues? Or axle issues? Help!!!!!

It could also be a bad trans mount or worn isolation bushings allowing things to move around.
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post #9 of 9 (permalink) Old Dec 25th, 11, 10:49 AM
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Re: Rear leaf spring issues? Or axle issues? Help!!!!!

might want to double check the condition of the u-joint at the differential. also make sure the "U" clamps are tight. I've seen worn u-joints only make noise at certain times, like hard acceleration...until they completely break apart.
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