Have a pulsating roar at 25mph and above.

Asked by scouter Sep 22, 2015 at 08:11 PM about the 1982 Chevrolet El Camino

Question type: Maintenance & Repair

have balanced drive shaft. have used another drive shaft from my 85
camino with no affect. have checked rear brakes. have checked posi rear
end. in perfect shape, no looseness. transmission shifts sharp and clean.
checked all transmission mounts and engine mounts. rear end fluid level
was low. noise was instantly there. quiet and smooth earlier. checked all
rear suspension bushings. not new but still in very good shape. this was a
restore i purchased recently. has a 350 crate motor hooked to a turbo 350.

4 Answers
221,015

Rowefast answered 8 years ago

Check the flex plate, they can crack, check torque converter bolts also, but it sounds like a cracked flex plate...

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scouter answered 8 years ago

Checked the flex plate and torque converter bolts, wasn't it. Very stumped by this as I have about four other mechanics looking at it and can't seem to pinpoint the problem. Tried putting it in neutral while roar was happening and had no effect. New shifter, but no vibration through shifter.

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221,015

Rowefast answered 8 years ago

Can you explain a bit more on this? Very interested. Any vibration that you can feel? Does this happen when you are driving or is it there when in park, does it go away at all? It's not the fan clutch engaged? The cracked flex plate you would have noticed a vibration,I thought that was it.

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