Author Topic: Harmonic Balancer question  (Read 492 times)

Offline zieg85

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Harmonic Balancer question
« on: July 19, 2019, 01:10:06 PM »
I have a slight vibration in my 85 C-30 with a 5.7L.  I am thinking I may need a new Harmonic Balancer.  Is there any brand names I should stay away from.  I am looking on eBay as a start. 
1985 C30 Custom Deluxe Ext. cab 5.7L TH400 3.21 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Online FlatBlack77

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Re: Harmonic Balancer question
« Reply #1 on: July 19, 2019, 02:33:53 PM »
Have you checked the engine and transmission mounts? I would start there
"When you are a hammer, everything looks like a nail"
'77 C/10 - 350/350 mild street motor

Offline zieg85

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    • 73-87 GM squarebody extended cab and conversions up to 91 R/V series
Re: Harmonic Balancer question
« Reply #2 on: July 19, 2019, 03:03:31 PM »
Have you checked the engine and transmission mounts? I would start there

The transmission has been removed and was a major source of the vibration.  I still feel a little still.  I am going to take all the v-belts off next to see if anything changes.  The engine runs very smooth and sounds really good.
1985 C30 Custom Deluxe Ext. cab 5.7L TH400 3.21 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline Stewart G Griffin

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Re: Harmonic Balancer question
« Reply #3 on: July 19, 2019, 04:30:27 PM »
i think pioneer and dorman have had bad reviews.   (Note: i think Dorman is ok with other parts though)


ATI, Fluidamper among others = good.