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04-13-2016, 09:17 AM | #1 |
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Effect of wind on these trucks, is it just mine?
I live in Iowa and it is very windy this time of year usually, almost every day for the past few weeks we have had 20-35mph sustained winds where I live in the country. I have noticed that on these days if I am having the misfortune of driving into the wind the cab noise is pretty bad, its like a loud rushing sound around the truck. I have replaced all the cab seals in the past 3 years and also added the extra 2nd set of door seals so its sealed up good - there are no air leak issues.
Is it just the nature of these trucks and their shape to be very sensitive to wind? I know heading into the wind I need to drop down into "D" or it will lug the engine down, worn out TBI engine probably isn't helping. Trying to figure out if there is a way to lessen the noise. I put some fatmat material on the drivers doorskin and I believe that helped, I am wondering if doing the floor and rear of the cab would also help. I am always trying to reduce noise and make it a more modern feeling truck. |
04-13-2016, 09:22 AM | #2 |
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Re: Effect of wind on these trucks, is it just mine?
Always windy here in Prescott, sometimes 60 mph winds, but 20-30 mph winds every other day this time of year is not unusual at all.
My 79 is quiet as a mouse. Unrestored original truck that drives very tight. Matter of fact, unless you crack a window, you have to put some effort in to shut the doors, it's that air tight. No sound deadening added either, just what the factory put there. I'm sure sound deadening would help your situation if that's what you want to do. Most of the classics that come through here now, people are requesting it so I sound deaden most of them nowadays. |
04-13-2016, 04:15 PM | #3 |
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Re: Effect of wind on these trucks, is it just mine?
My 81 has a fair amount of noise that is multiplied a bunch when then wind is howling. I've got all new gaskets as well. Most of my noise comes from wind passing around the vent windows.
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04-13-2016, 04:33 PM | #4 |
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Re: Effect of wind on these trucks, is it just mine?
New gaskets can actually be a cause. Not always but in most cases from my experience here restoring these classic cars, the quality of aftermarket weather strip leaves a lot to be desired. The only really good stuff out there are NOS pieces. Very hard to find now for 40+ year old cars and you pay out the nose for it.
Might have some luck finding some for a square truck though, not that old yet. That's why I mentioned my truck being unrestored and original and never been apart. It has perfect OEM weather stripping throughout the truck and seals up air tight. One of the quietest squares I've ever owned. The other square I had before I completely restored and had it all blown apart, fresh paint and new repo weather strip installed everywhere etc... It always had some highway wind noise no matter how tight I adjusted the doors. On that same note, I'm reluctant to replace some areas of weather strip on certain classic cars if I can help it at all, one area especially is around the drip rails on a hardtop car (door glass isn't surrounded by framework). Quality of reproductions has been horrible lately and in most cases you'll have wind noise around the glass no matter how you adjust the door and/or the glass. Can be frustrating for sure. |
04-14-2016, 08:48 AM | #5 |
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Re: Effect of wind on these trucks, is it just mine?
I have owned a 73, 76, and 83 square. All had a lot of wind noise on the highway. The worst is my current 83, which I think has to do with the drip rails and aftermarket door seals, as stated above. I hear that Precision brand is the best, so I might try that in the future.
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04-14-2016, 08:55 AM | #6 |
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Re: Effect of wind on these trucks, is it just mine?
The sliding rear window is where most of my cab noise comes from. But with no AC it is a necessary evil.
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04-14-2016, 11:53 AM | #7 | |
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Re: Effect of wind on these trucks, is it just mine?
Quote:
The other 14,999,999 were noisy when new, primarily from the vent window area. K
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04-14-2016, 12:17 PM | #8 |
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Re: Effect of wind on these trucks, is it just mine?
Its not so much air leaks that I get the noise from, its sealed up really nice. The problem seems to be a "rushing" sound over the whole truck and its related to the windiness of the day. On a nice calm day I can run it up to 85-90 mph and its really nice and quiet inside. On a windy day with 30 mph winds, driving into the headwind at 55 mph will makes a low roar around the cab. Something with the wind and the dynamics of how it flows over the body I think.
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04-14-2016, 12:19 PM | #9 |
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Re: Effect of wind on these trucks, is it just mine?
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04-14-2016, 12:55 PM | #10 |
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Re: Effect of wind on these trucks, is it just mine?
If you're going to do sound-deadening material like a Fatmat or Dynamat, I think you're most effective areas for getting rid of wind noise would be your door skins, and your ceiling.
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04-14-2016, 02:15 PM | #11 | |
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Re: Effect of wind on these trucks, is it just mine?
Quote:
We used to fluff/puff vehicles for executive use, media rides, development work, etc. Before we even saw the truck we knew what the first three fixes were going to be: 1) Fix wind noise 2) Balance and vector tire/wheel assemblies 3) System balance driveline 4) Anything else we found K
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04-14-2016, 03:11 PM | #12 | |
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Re: Effect of wind on these trucks, is it just mine?
Quote:
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04-14-2016, 03:42 PM | #13 |
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Re: Effect of wind on these trucks, is it just mine?
I drove from Indianapolis to Champaign a couple weekends back. 70-75 mph into a 40 mph wind, so an air speed of 110+ mph. It was like driving a shop vac.
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Rich Weyand 1978 K10 RCSB DD. |
04-14-2016, 04:24 PM | #14 |
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Re: Effect of wind on these trucks, is it just mine?
Is there any modification we can do around the wing windows that will decrease the noise?
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04-14-2016, 05:46 PM | #15 |
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Re: Effect of wind on these trucks, is it just mine?
This made a world of difference in the wind noise in my 87.
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04-14-2016, 10:33 PM | #16 |
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Re: Effect of wind on these trucks, is it just mine?
Some put a slip of paper in, for example the wing window and door checking its resistance to being pulled. The later approach is pressurize the cab w/ smoke and look for leaks.
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04-15-2016, 11:02 AM | #17 |
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Re: Effect of wind on these trucks, is it just mine?
I never use the vent windows - thinking of a bead of silicone to seal 'em up good </redneck_fix>. Rear slider reduces buffeting huge when the windows are down.
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04-15-2016, 08:49 PM | #18 |
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Re: Effect of wind on these trucks, is it just mine?
Hey Rich I too live in wonderful (?) Bloomington.
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04-15-2016, 09:00 PM | #19 |
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Re: Effect of wind on these trucks, is it just mine?
That makes three of us....
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Rich Weyand 1978 K10 RCSB DD. |
06-10-2016, 11:39 AM | #20 |
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Re: Effect of wind on these trucks, is it just mine?
I also have a lot of wind noise in my "85 stepper. I have shaved (removed) the dip rail. I was thinking of installing the drip weather strip from a 1992-1998. Not sure if it will fit but it would take up the gap near the top of the door. Has anyone installed the extra drip weather strip on a square?
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06-11-2016, 04:25 AM | #21 | |
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Re: Effect of wind on these trucks, is it just mine?
Quote:
When I worked part time for my dad back in high school. He got a brand new '76 C30 flat bed for deliveries. That truck was as noisy as the old beat up '62 GMC 3500 with a V6 that he had.
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06-12-2016, 08:50 AM | #22 | |
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Re: Effect of wind on these trucks, is it just mine?
Quote:
I did have a 77 factory 454 1/2 ton that I restored back in the early 90's, all new GM sheet metal. Only piece original to the truck was the cab. Even with all new weather stripping and many hours spent with door alignment (and many more getting body gaps tighter than factory) That thing made a fair amount of wind noise. I think like Keith hints at, sometimes you get a good one. The funny part of all that, I owned both at the same time. I Bought the 79 454 1 ton and drove it across country 1900 miles with the intention of stripping the drivetrain for the 77. Realized how tight and beautiful the truck was on that cross country trip and before I got home decided to sell the 77 instead and keep the 79 intact. Glad I did. 20+ years later I still have it and it's been a fantastic truck. Just something to be said about original unrestored vehicles and how they drive/feel. Last edited by Firebirdjones; 06-12-2016 at 08:56 AM. |
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06-12-2016, 10:54 AM | #23 | |
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Re: Effect of wind on these trucks, is it just mine?
Quote:
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1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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06-12-2016, 11:07 AM | #24 | |
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Re: Effect of wind on these trucks, is it just mine?
Quote:
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1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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06-12-2016, 12:04 PM | #25 |
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Re: Effect of wind on these trucks, is it just mine?
Yup, my 79 is the same way. With the windows up you need a little extra effort to shut the doors.
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