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Firewall grommet size

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Old Aug 4, 2024 | 07:34 PM
  #1  
Klynsma76's Avatar
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From: Omaha, NE
Car: 1986 Firebird
Engine: 6.0 LQ4
Transmission: TH350
Axle/Gears: 10 bolt 3.43
Firewall grommet size

Hi,
I am currently trying to figure out what wiring or grommet I am missing from my firewall. Also, what is the size the speedometer cable grommet. I've been trying to look it up online for a while and am stumped Thanks!

.
trying to figure out what wire this is?
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Old Aug 5, 2024 | 11:46 PM
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Klynsma76's Avatar
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From: Omaha, NE
Car: 1986 Firebird
Engine: 6.0 LQ4
Transmission: TH350
Axle/Gears: 10 bolt 3.43
Re: Firewall grommet size

I anyone is interested I figured out the size of the grommet I need (1.25 in). Still no idea what is missing.
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Old Mar 21, 2025 | 10:22 PM
  #3  
tchoupshop's Avatar
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From: New Orleans, LA
Car: 1989 Firebird Formula
Engine: L03 5.0 TBI
Transmission: 700R4
Re: Firewall grommet size

I was left with two open firewall holes in this area after my build which I plugged. At least one of them was for cruise control. Do you have cruise?
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Old Mar 21, 2025 | 10:29 PM
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Klynsma76's Avatar
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From: Omaha, NE
Car: 1986 Firebird
Engine: 6.0 LQ4
Transmission: TH350
Axle/Gears: 10 bolt 3.43
Re: Firewall grommet size

Nope!
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Old Mar 21, 2025 | 11:03 PM
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Car: '89 Firebird
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Transmission: T56
Re: Firewall grommet size

Oh, I guarantee you'll figure out what that open hole is for all by yourself without any help. I am damn sure of that.

Originally Posted by Klynsma76
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Old Mar 21, 2025 | 11:05 PM
  #6  
Klynsma76's Avatar
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From: Omaha, NE
Car: 1986 Firebird
Engine: 6.0 LQ4
Transmission: TH350
Axle/Gears: 10 bolt 3.43
Re: Firewall grommet size

Originally Posted by QwkTrip
Oh, I guarantee you'll figure this one out all by yourself without any help. I am damn sure of that.
I sure did lol
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Old Mar 21, 2025 | 11:08 PM
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Car: '89 Firebird
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Re: Firewall grommet size

Originally Posted by Klynsma76
I sure did lol
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Old Mar 13, 2026 | 12:30 PM
  #8  
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Re: Firewall grommet size

Originally Posted by Klynsma76
I anyone is interested I figured out the size of the grommet I need (1.25 in). Still no idea what is missing.
I know it’s been a year since someone commented on this thread, I see you note it was a 1.25” grommet just wondering where you purchased it at. Have a new Speedo cable going in and I’m missing the grommet as well.
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Old Mar 13, 2026 | 03:50 PM
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Klynsma76's Avatar
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From: Omaha, NE
Car: 1986 Firebird
Engine: 6.0 LQ4
Transmission: TH350
Axle/Gears: 10 bolt 3.43
Re: Firewall grommet size

sent you a pm
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