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Black putty used on the speed nuts for the GFX…

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Old Apr 25, 2026 | 08:09 PM
  #1  
Mikos_89's Avatar
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From: So. Cal
Car: '89 GTA, '15 Camaro LS 6sp.
Engine: L98, LFX.
Transmission: 4L60, AY6.
Axle/Gears: 3.27's.
Black putty used on the speed nuts for the GFX…

Where can I get that black/dark gray putty sealer that GM used on the speed nuts that hold the GFX on? Mine are all dried out.
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Old Yesterday | 09:13 AM
  #2  
72buickgs's Avatar
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From: Windsor, On
Car: 1984 Trans AM
Engine: 305
Transmission: 700-4r
Axle/Gears: 3.23
Re: Black putty used on the speed nuts for the GFX…

Maybe u could use "plumber's putty". I have used it.
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Old Yesterday | 09:39 AM
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mikeceli's Avatar
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From: S. UTAH
Car: 1989 IROC-Z 305 LB9 AT Convertible
Engine: LB9 305
Transmission: AT
Re: Black putty used on the speed nuts for the GFX…

Plumbers putty is different composition and cream colored. NOT Butyl rubber.

I just bought below on Amazon, and it is just like the 3M Brand, i bought previously (like 20+ years ago)!

Amazon Amazon
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Old Yesterday | 04:49 PM
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Black putty used on the speed nuts for the GFX…

It's like 3m butyl tape iirc
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