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Intermittent grinding noise rotational
#737584 June 26th 2018 3:11 pm
Joined: Aug 2010
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Doone Offline OP
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I had my shocks changed out and I changed my power steering fluid. About 20 miles afterward a grinding noise that is definitely rotational showed up. I checked the trans fluid and its clean, clear and has no burning odor, Trans not slipping, all up and downshifts good -even in kickdown mode, however intermittent noise rises and falls more with engine rpm rather than wheel speed. I checked the ebrake and its operating properly stopped or in motion. Checked u joints, no clicking or unusual movement. Noise present on acceleration but fades with speed or by taking foot off the throttle. All vacuum and emissions functioning properly.


Any ideas anyone? 305 F code automatic.
Thanx, Doone


85 Chevy Beauville G20

Re: Intermittent grinding noise rotational
Doone #737586 June 26th 2018 3:30 pm
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Sounds like the steering pump to me. What fluid did you use?


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Re: Intermittent grinding noise rotational
tuner4life #737599 June 26th 2018 5:32 pm
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Doone Offline OP
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Thanx for your reply, Ive only put about 50 miles on since fluid change. I used a fresh bottle of STP ps fluid If I put in wrong type, I can change it out again, I hope its no biggie, should I have used dexron atf?

Last edited by Doone; June 26th 2018 5:54 pm.

85 Chevy Beauville G20

Re: Intermittent grinding noise rotational
Doone #737600 June 26th 2018 5:36 pm
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T Y


85 Chevy Beauville G20

Re: Intermittent grinding noise rotational
Doone #737606 June 26th 2018 9:41 pm
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Never changed PS fluid in 50 years of wrenching. In a steering pump /box the fluid is basically hydraulic fluid. No real wear factor.


Tucson-it's a dry heat...like an oven
Re: Intermittent grinding noise rotational
Hasan Ben Sobar #737631 June 27th 2018 9:37 am
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Doone Offline OP
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Thanks, in a 38 y o truck it does tend to become dirty, especially if prior owners neglected to properly service.


85 Chevy Beauville G20

Re: Intermittent grinding noise rotational
Doone #737660 June 28th 2018 8:48 am
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Hi Doone, Welcome to the site!

I've have had quite a few bearing failures in the Rotating assembly on the Serpentine systems in my "Newer," model Vans. West Texas is HARD on vehicles...

Also half a dozen Alternator bearing failures of the years. An AC clutch bearing failure will make that noise as well. Try and isolate it with a mechanics stethoscope. BE Extremely careful.

Daaaamn Ben, and I thought I was an Old Dog... Cheers!

Re: Intermittent grinding noise rotational
Wedgy #737673 June 28th 2018 6:27 pm
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Doone Offline OP
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Thanx 4 your reply, I just changed out the ps fluid again and will take 4 a cruise tonite to see if that eliminated that possibility. I dont think its the alt as I changed that out about 1500 miles ago and it works fine. I will check out the a/c clutch next, hadnt thought of that, it blows real cold and theres no burnt smell in that area. I will get a hold of a stethoscope to listen to the idler pulley and belts as you suggested. 'Preciate your help pardner, lots of open space between those west Texas towns I hear.


85 Chevy Beauville G20

Re: Intermittent grinding noise rotational
Doone #737680 June 28th 2018 9:25 pm
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Nope, now it hums loud with a vibrarion so Im thinkin its drive shaft related either a yoke or the universals. Wish I had a hydraulic lift.


85 Chevy Beauville G20

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