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Old 07-05-2018, 03:12 PM   #15
Jetscv25
 
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For people that say 3.91 gears are to much!!! They are wrong all day long!!
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Old 07-05-2018, 03:13 PM   #16
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Next up flex fuel sensor, fuel system and injectors and a nice Whipple on top!!!!! Coming next month!!
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Old 07-05-2018, 03:38 PM   #17
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Quote:
Originally Posted by Jetscv25 View Post
For people that say 3.91 gears are to much!!! They are wrong all day long!!
What rpm are you turning during interstate driving @ 70-75 mph?
I like to take weekend trips and don’t want the buzz of big gears.
Thanks.
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Old 07-05-2018, 03:45 PM   #18
Royal Tiger
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Originally Posted by Pro-tuned View Post
I have the factory converter as I drive the car daily. I must add with 3.45 gears, truetrac, and 1500HP axle shafts. I have enough in the engine to pull the car through, but if I were to change converter I would use a 2,800 stall conveter.
Is that low?

From what I have read and been told I should be looking at 3400.

Thanks.
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Old 07-06-2018, 07:55 AM   #19
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Originally Posted by Jetscv25 View Post
Next up flex fuel sensor, fuel system and injectors and a nice Whipple on top!!!!! Coming next month!!
That's a great build you've got going! What is your target whp?

Regarding the 3.91 gears, couldn't agree more. The SS should have been geared this way from the factory.
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Old 07-06-2018, 08:01 AM   #20
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Originally Posted by Screwblower View Post
What rpm are you turning during interstate driving @ 70-75 mph?
I like to take weekend trips and don’t want the buzz of big gears.
Thanks.
The 3.91 gears, if installed correctly, shouldn't buzz or make noise.

In top gear at 75 mph, my engine turns about 2,200 rpm. My cam doesn't like cruising at low rpms, so I generally don't use top gear, but run 75 mph in 5th gear around 2,800 rpm.
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Old 07-06-2018, 12:13 PM   #21
Pro-tuned
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Quote:
Originally Posted by Royal Tiger View Post
Is that low?

From what I have read and been told I should be looking at 3400.

Thanks.
Some guys need the gearing but if you retain the power and are pulling out the hole strong, save it for the top end, and make use of the lower gear. For NA it might be helpful.
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Old 07-06-2018, 03:59 PM   #22
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3.91 are considered lower gears while 3.45 are higher gears. There's an inverse relationship at work there.

Best of luck with the rest of your build OP. She's gonna give you a severe case of perma grin!!
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Old 07-06-2018, 06:29 PM   #23
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Quote:
Originally Posted by Taylortoons View Post
The 3.91 gears, if installed correctly, shouldn't buzz or make noise.

In top gear at 75 mph, my engine turns about 2,200 rpm. My cam doesn't like cruising at low rpms, so I generally don't use top gear, but run 75 mph in 5th gear around 2,800 rpm.
Thanks.
I was referring to engine buzz.(RPM)
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Old 07-07-2018, 09:49 PM   #24
rontammy0
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Quote:
Originally Posted by Jetscv25 View Post
For people that say 3.91 gears are to much!!! They are wrong all day long!!
Ya they are perfect. Those comments always come from people that don't have them.
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