whine only in park and neutral

[dcZ71]

1994 original 4l60e 170k miles.

When I'm in park and neutral I get a high pitched whine from what seems like under the hood. Is something wrong with my transmission? it acts fine otherwise.

 

[JollyGreen]

If it sounds like its coming from under the hood it could be a multitude of things. Belt, PS pump, and any number of pulleys. Are you sure that's where its coming from?

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[dcZ71]

I need to investigate further but its somewhere around the front. Sounds like when a power steering pump is low on fluid but fluid is fine, it is a little squeaky when turning in parking lots.
The whine going away in gear is worry some to me. Video coming....

 

[JollyGreen]

OK. Interested in listening to it.

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[dcZ71]

ahh just went out and started for 5 minutes, doesn't do it cold

 

[JollyGreen]

ahh just went out and started for 5 minutes, doesn't do it cold

Weird....

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[gnrl]

hmm my buddy's 4l60 had this problem. But his eventually turned into having the whine all the time (park/neutral + low speed, high speed, all gears etc), so it might not be the same problem.

for what it's worth...he changed the 2-4 servo and that shut it right up. The truck was at about 150k.

 

[dcZ71]

ok its intermittent. sometimes its there sometimes not, sometimes in gear sometimes not. I'm not too worried, just keep truckin.

 

[Virginiabound]

Sounds like a worn pulley that only whines when the rpm is at a certain point.

Dropping into "gear" lowers your idle below the rpm needed to cause the noise.

 

[dcZ71]

alright here it is....

all gears...

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underneath in park...

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doesnt whine when on the gas, let off at 0:13....

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