Metal below windshield - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ryans69chevy · 05-20-2025, 10:19 PM

Funky title. What's this channel of missing metal all about? The only thing I can come up with is for water drainage. Pic is of the drivers side. It's the same story on the passengers side, just looks a little different.

I have my cab ripped apart repairing all the rust. If there is no point to this "channel", should I add in a piece of metal there or just leave it like this?

**Jason Banks** · 05-20-2025, 10:23 PM

It is just where the different panels all come together. It normally has seam sealer in it. I see no reason you could not weld it up with a filler piece.

**1970cstblazer** · 05-21-2025, 08:25 AM

Usually there is a big gob of seam sealant there.

HO455 · 05-21-2025, 02:14 PM

I'm pretty sure the gap is there to allow for panel differences during the assembly of the cab. The cab pieces were fit around an windshield jig and other clamps and jigs before welding. There needed to be some adjustment room. I'm sure others like Mr Seymore who can speak to this with more authority.

**Rust_never_sleeps** · 05-21-2025, 07:56 PM

Those holes are from when they computer balanced the windshield ;-)

**clay68c10** · 05-22-2025, 08:18 AM

Weld it up. You can do the visible gaps at the top as well.

ryans69chevy · 06-09-2025, 11:44 PM

Thanks for the help! I think I will close them up.

BRL · 06-09-2025, 11:55 PM

Quote:

Originally Posted by Rust_never_sleeps

Those holes are from when they computer balanced the windshield ;-)

jumpsoffrock · 06-10-2025, 06:05 PM

Quote:

Originally Posted by HO455

I'm pretty sure the gap is there to allow for panel differences during the assembly of the cab. The cab pieces were fit around an windshield jig and other clamps and jigs before welding. There needed to be some adjustment room. I'm sure others like Mr Seymore who can speak to this with more authority.

Very interesting. I would LOVE to know exactly how they built these cabs at the factory. I also wonder if they built them where the trucks were assembled, or if other factories built the cabs and sent assembled cabs bare to places like Fremont etc.

05-20-2025, 10:19 PM	#1
ryans69chevy Registered User Join Date: Sep 2010 Location: Casselton, North Dakota 58012 Posts: 1,133	Metal below windshield Funky title. What's this channel of missing metal all about? The only thing I can come up with is for water drainage. Pic is of the drivers side. It's the same story on the passengers side, just looks a little different. I have my cab ripped apart repairing all the rust. If there is no point to this "channel", should I add in a piece of metal there or just leave it like this? Attached Images

05-20-2025, 10:23 PM	#2
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,787	Re: Metal below windshield It is just where the different panels all come together. It normally has seam sealer in it. I see no reason you could not weld it up with a filler piece.

05-21-2025, 08:25 AM	#3
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 2,501	Re: Metal below windshield Usually there is a big gob of seam sealant there. __________________ 1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels

05-21-2025, 02:14 PM	#4
HO455 Registered User Join Date: Feb 2016 Location: Portland Oregon Posts: 12,411	Re: Metal below windshield I'm pretty sure the gap is there to allow for panel differences during the assembly of the cab. The cab pieces were fit around an windshield jig and other clamps and jigs before welding. There needed to be some adjustment room. I'm sure others like Mr Seymore who can speak to this with more authority. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

05-21-2025, 07:56 PM	#5
Rust_never_sleeps Senior Member Join Date: Jun 2022 Location: San Ramon,CA Posts: 1,071	Re: Metal below windshield Those holes are from when they computer balanced the windshield ;-) __________________ 1970 C10 Custom longbed 350/350 “Carburetors are forgiving, timing is not” — Thunderhead289

05-22-2025, 08:18 AM	#6
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 3,135	Re: Metal below windshield Weld it up. You can do the visible gaps at the top as well. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

06-09-2025, 11:44 PM	#7
ryans69chevy Registered User Join Date: Sep 2010 Location: Casselton, North Dakota 58012 Posts: 1,133	Re: Metal below windshield Thanks for the help! I think I will close them up.



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