Nasty Noise Coming From Flexplate/Converter area

[AKguy]

1985 K20 Suburban, 350/700R4, 14” 168 tooth flexplate, three bolt converter. When warm/hot, about 90 here today, getting fairly loud, tinny/grinding noise while parked and in motion. Looked at starter intereference, none I could fine, put different starter on, no change. Truck is shifting as it should, fluids are up, no visible leaks, no visible cracks in the flexplate, converter is torqued. New one on me.

 

[AKguy]

Just saw 1987 Jimmy’s similiar post and it sure sounds like cracked flexplate!

 

[Memaloose]

On my '79 Silverado K20 with a small block 400, the welded balance weight on the flex plate came loose and made a racket like you describe. I don't know if yours is externally balanced but it's one more thing to look at.

 

[Goldie Driver]

I had a funny noise at idle in my Camaro that I could hear when parked next to another car.

IIRC, the converter was failing- 2800 stalll Vigilante. The mechanics discovered that post mortem when the tranny bit the dust at 60MPH.

So, point being, a case where it is worth getting it looked at now while the fix may be cheaper...

And, hoping I am wrong about your rig.

 

[AKguy]

Mechanic just told me the flexplate is fine, going to replace the converter. Stand by for more.

 

[AKguy]

Converter, B-29, replaced, drives fine, no noise. Just in time as I am headed home (flying) to the frozen north in a few days.

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[85 Squarebody76]

Converter, B-29, replaced, drives fine, no noise. Just in time as I am headed home (flying) to the frozen north in a few days.

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Really like the color scheme you got there... lookin gud

 

[AKguy]

Belongs to family in NM. Hood has been replaced since pic was taken.

 

[squareton]

Converter, B-29, replaced, drives fine, no noise. Just in time as I am headed home (flying) to the frozen north in a few days.

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looks great! what height lift is that? springs only?

 

[AKguy]

Springs on the front, leveler blocks in the back.

 

[80BrownK10]

looks great! what height lift is that? springs only?

Looks like about 3"

 

[Squirrely Brother]

My flex plate looked just fine until I unbolted it and every bolt hole was cracked. I thought it might be the converter, but was glad it ended up being a $33 part with 3 hours work to fix it. I hope your mechanic’s mistaken.

 

[80BrownK10]

My flex plate looked just fine until I unbolted it and every bolt hole was cracked. I thought it might be the converter, but was glad it ended up being a $33 part with 3 hours work to fix it. I hope your mechanic’s mistaken.

I think he fixed it if I remember reading the last post right. Was a bad converter.