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Old May 25, 2010 | 11:57 PM
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Default Stupid question i know

i was told to ask if a c3 is supposed to sound louder (not exhaust wise) while on the highway in comparrision to say an 87 because of the lack of overdrive.
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Old May 26, 2010 | 07:06 AM
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Default Yes, its a 60's thing

Hard to compare a Corvette manufactured form 63 to 82 to my 2010 Fusion or even a late 80's car.
Sound deeding material, outside shapes, suspensions and tires have all changed to meet the demand of the 2000's driver.
New cars are quiet, low to the ground, big tires and refined suspensions.
My 78 has wind noise, mechanical noise, smells, hot, vibrates and the tires, transmission and engine are loud allover______ I think I of love it.
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Old May 26, 2010 | 07:30 AM
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Yes, overall a C3 will be louder than a C4 because all the things mikep3 mentioned above.
I have both and the c4 is much quieter even with the louder exhaust.
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Old May 26, 2010 | 08:09 AM
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Originally Posted by Valic
i was told to ask if a c3 is supposed to sound louder (not exhaust wise) while on the highway in comparrision to say an 87 because of the lack of overdrive.
It's not supposed to be, that's just the way it is. If you wanted a quiet early 70's car back then, you bought a Cadillac.
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Old May 26, 2010 | 09:54 AM
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Originally Posted by bashcraft
It's not supposed to be, that's just the way it is. If you wanted a quiet early 70's car back then, you bought a Cadillac.
the point in questions is that the cars motor sounds like its working more on the highway than the 87 we had i was wondering if its normal or might my trans be malfunctioning i figured since its an auto i only have 1/2/3 no overdrive like the 87 thats its supposed to sound that way at higher speeeds but i dont want to break anything. and since my tach is broken i have no idea what the rpms are like
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Old May 26, 2010 | 10:20 AM
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This will also depend on what the rearend gear ratio is. If you have 2:87 the engine will be running at lower RPM than if you have 3:73 or higher. What is the differance in RPM between the 2 cars?

I have an 82 that does have an overdrive transmission with 2:87 gears and it's still noisy but it is from the highway and tires not the engine working hard.
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Old May 26, 2010 | 10:36 AM
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The engine will turn higher RPM's since it's a 3 speed tranny, so you'll get a bit more noise, especially with a exhaust system on there. My '78 Z28 has a TH350 and when I'm on the highway it's a bit loud. If you want to fix that problem drop in an overdrive transmission and get less noise and more miles per gallon.
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Old May 27, 2010 | 08:33 PM
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Originally Posted by jordan89
The engine will turn higher RPM's since it's a 3 speed tranny, so you'll get a bit more noise, especially with a exhaust system on there. My '78 Z28 has a TH350 and when I'm on the highway it's a bit loud. If you want to fix that problem drop in an overdrive transmission and get less noise and more miles per gallon.
i havent been so much worried about the noise as much as wether or not it was normal or if something was wrong/broken
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Old May 27, 2010 | 08:33 PM
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I think I am turing around 3500rpm in my 76 at 60mph. It has the TH350 tranny and i belive 3.08 gears.

In comparison my 6 speed 98 camaro runs around 1200rpm at 60mph.
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Old May 27, 2010 | 11:09 PM
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Originally Posted by Valic
i havent been so much worried about the noise as much as wether or not it was normal or if something was wrong/broken
Nothing's wrong. That's how it is with the 3 speed trannys. Can you imagine how a 2 speed powerglide tranny would be.
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Old May 28, 2010 | 06:48 AM
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Originally Posted by jordan89
Nothing's wrong. That's how it is with the 3 speed trannys. Can you imagine how a 2 speed powerglide tranny would be.
Think about that statement for a minute. It would be exactly the same with a 2 speed as it is with a 3 speed. Once your in high gear your at a 1:1 ratio with either transmission. The advantage of the 4 speed automatic is at has overdrive which reduces the ratio.
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Old May 28, 2010 | 12:48 PM
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why dont you fix the tachometer and resolve the issue as to whether you have a problem
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Old May 30, 2010 | 08:35 AM
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Originally Posted by MelWff
why dont you fix the tachometer and resolve the issue as to whether you have a problem
i plan to soon been spending a lot of money lately with 2 79's one basically done the next one just started lol since they were both autos the tach was last on the list which is funny the new one i bought the tach worked so i swap them but there's no way its accurate sicne in the drive way its reading like 1300 rpm and the cars barely running so both need to be replaced

Last edited by Valic; May 30, 2010 at 08:40 AM.
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