11-06-2016, 08:22 PM | #1 |
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Mystery Firewall Hole
Here are two photos of the mysterious oval-shaped hole in my firewall. Just guessing, I'd say the hole was to accommodate an overdrive control rod, but I don't really know. Can anybody confirm, or tell what its purpose was.
You can see that mine was covered with tape, appears to have been that way since new. I found a proper blanking plate at a boneyard, and installed it today.
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Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
11-06-2016, 08:34 PM | #2 |
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Re: Mystery Firewall Hole
That hole is for the clutch linkage on manual trans trucks.
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
11-06-2016, 09:00 PM | #3 |
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Re: Mystery Firewall Hole
Thanks. And I have absolutely no idea why the photos got rotated.
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Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
11-06-2016, 09:16 PM | #4 |
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Re: Mystery Firewall Hole
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11-06-2016, 10:06 PM | #5 |
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Re: Mystery Firewall Hole
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11-06-2016, 10:25 PM | #6 |
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Re: Mystery Firewall Hole
So any auto truck SHOULD have had one? Good to know. Thanks.
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11-06-2016, 10:41 PM | #7 |
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Re: Mystery Firewall Hole
Yes, mine came off a bone yard donor 71 or 72, with an auto trans. Had to pay $5, sheesh!
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Rick -69 GMC 910 Long Box, 350 -98 Chev Silverado 1500, 350 Vortec 4L60e -08 Mustang GT Convertible |
11-06-2016, 10:51 PM | #8 |
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Re: Mystery Firewall Hole
The metal plates were used for at least 71 and 72. 69s and earlier had silver plastic plugs. Not sure which 70s used, but I think the plugs. If yours is missing and there are no screw holes, it had a plug from the factory. The plugs were put in from the driver side and frequently popped out when the doors of the cabs were closed. New plugs are available here: http://67-72chevytrucks.com/vboard/s...=clutch+delete
The plates are frequently listed on the for sale forum. Just search that forum for "clutch delete Here's the plug in my 69. Last edited by FirstOwner69; 11-06-2016 at 10:59 PM. |
11-06-2016, 10:55 PM | #9 |
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Re: Mystery Firewall Hole
Hey guys I dint need the plug but I need that grommet for my 69,.. Anybody know where I can find one? My is gone and I have an open hole with the rod coming through... Funny I was just about to post this and the OP beat me to it. Sorry to hijack the thread OP. Thanks
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11-06-2016, 11:27 PM | #10 |
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Re: Mystery Firewall Hole
Thanks guys, especially FirstOwner69 for the detailed reply and link. The plug does look much cleaner, but staying put is important too. Mine was 4spd so no plug either way. When I can ditch the th350 and go back to manual I think I'll probably use the bolt on kind.
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11-07-2016, 12:34 PM | #11 | |
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Re: Mystery Firewall Hole
Quote:
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 Last edited by Already Gone; 11-08-2016 at 02:55 AM. |
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11-07-2016, 10:06 PM | #12 |
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Re: Mystery Firewall Hole
I just welded a plug in my hole, body worked it, paint, can't tell it was there
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11-07-2016, 11:15 PM | #13 |
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Re: Mystery Firewall Hole
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