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03-19-2019, 01:55 PM
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#1 |
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Registered User
 Join Date: Jun 2017
Location: New Orleans
Posts: 386
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73-80 Firewall Holes
Curious if I can get some help to label all the holes in the 73-80 firewall. I don't want to fill something I may need during assembly later on.
I'll update this posts as we can identify them. 1.-Dash Brace 2.-Throttle Pedal(3 hole cluster) 3.-Throttle cable(rectangular hole) 4.-Transmission kickdown grommet 5.-Tach grommet 6.-Dual Fuel Tank grommet 7.-Wiper Motor(larger hole + 3 mounting hole cluster) 8.-Wiring Harness Pass-through(square cut out + 2 mounting holes) 9.-Emergency Brake (2 hole cluster) 10.-Wiring grommet to cruise control, possibly other features 11.-Firewall insulation hold down Not pictured or numbered is the e-brake cable exist which is in the bottom of the firewall, pointing straight down.  I appreciate everyone's help to get this filled out. Thanks 
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1949 Chevy 3100 P/U http://67-72chevytrucks.com/vboard/s...d.php?t=302780 1976 GMC Sierra Classic C35 CCSB http://67-72chevytrucks.com/vboard/s...25#post8188825 Last edited by RADustin; 03-20-2019 at 02:13 PM. |
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03-20-2019, 06:27 AM
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#2 |
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Senior Member
Join Date: Jun 2015
Location: Atlanta, GA.
Posts: 737
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Re: 73-80 Firewall Holes
If number 3 is a square hole it looks to be the throttle cable.
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Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project |
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03-20-2019, 08:43 AM
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#3 | |
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Registered User
Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: 73-80 Firewall Holes
Quote:
Thanks
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1949 Chevy 3100 P/U http://67-72chevytrucks.com/vboard/s...d.php?t=302780 1976 GMC Sierra Classic C35 CCSB http://67-72chevytrucks.com/vboard/s...25#post8188825 |
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03-20-2019, 09:37 AM
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#4 |
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Registered User
Join Date: Nov 2010
Location: cape may nj
Posts: 94
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Re: 73-80 Firewall Holes
5 or 6 hood release cable hole if equipped ?
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03-20-2019, 10:23 AM
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#5 |
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Registered User
Join Date: May 2018
Location: Livermore CA
Posts: 7
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Re: 73-80 Firewall Holes
10 is cruise control on my 76. But its also used for other powered accessories in the engine compartment like dual battery etc. 11 is a firewall insulation hold down.
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03-20-2019, 10:24 AM
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#6 | ||
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Registered User
Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: 73-80 Firewall Holes
Quote:
Quote:
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1949 Chevy 3100 P/U http://67-72chevytrucks.com/vboard/s...d.php?t=302780 1976 GMC Sierra Classic C35 CCSB http://67-72chevytrucks.com/vboard/s...25#post8188825 |
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03-20-2019, 02:10 PM
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#7 |
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Account Suspended
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
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Re: 73-80 Firewall Holes
4 is for TH400 kickdown grommet, 5 can be for tach grommet. 6 I think is for dual tank grommet.
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03-20-2019, 02:12 PM
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#8 | |
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Registered User
Join Date: Jun 2017
Location: New Orleans
Posts: 386
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Re: 73-80 Firewall Holes
Quote:
__________________
1949 Chevy 3100 P/U http://67-72chevytrucks.com/vboard/s...d.php?t=302780 1976 GMC Sierra Classic C35 CCSB http://67-72chevytrucks.com/vboard/s...25#post8188825 |
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12-25-2021, 09:58 PM
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#9 |
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Registered User
Join Date: Feb 2003
Location: Staunton, Virginia
Posts: 554
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Re: 73-80 Firewall Holes
Hi & thanks for posting the pic & info, very helpful! I do have a question about hole labeled #1. I have an 80 Jimmy that definitely has that hole, but nothing under the dash. Does anyone have a picture of the "Dash Brace" that's supposed to be there? Any help is much appreciated!
Scott |
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