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anyone running 3.90 gears

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Old 01-15-2008, 10:42 PM
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Default anyone running 3.90 gears
just wondering. how do you like them? track times? crusing rpm's? thanks
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Old 01-15-2008, 11:24 PM
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the breeze is running 3.90 gears
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Old 01-16-2008, 12:16 AM
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i have 3.90's on my truck i do about 2300rpm at about 70mph...
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Old 01-16-2008, 09:35 AM
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Originally Posted by graysilv
i have 3.90's on my truck i do about 2300rpm at about 70mph...

How tall are your tires ?? sounds like about 28-29" I',m thinking 4.10's but with 31.6" tires so expected 70 to be about 2200
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Old 01-16-2008, 02:48 PM
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Originally Posted by graysilv
i have 3.90's on my truck i do about 2300rpm at about 70mph...
x2 im running 3.90's and with 295 40 20's i run 2300-2400 rpms at 70
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Old 01-16-2008, 04:59 PM
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Originally Posted by chev5.3
x2 im running 3.90's and with 295 40 20's i run 2300-2400 rpms at 70

Ok makes sense that is a 29" tire any idea how much mileage you off from stock 3.42"s
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Old 01-16-2008, 05:11 PM
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i'm running 3.90's also with 275 45 20 70 at around 2300
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Old 01-16-2008, 05:11 PM
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with 3.42 2200 rpm
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Old 01-17-2008, 12:31 PM
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Originally Posted by CDN SS
How tall are your tires ?? sounds like about 28-29" I',m thinking 4.10's but with 31.6" tires so expected 70 to be about 2200
my tires are 275/35/22
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Old 01-17-2008, 02:08 PM
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Sorry I just saw this thread, If my memory serves me right I believe at 65 mph its at 2100rpm with 285/50/20s so its not so bad cruising and I like it at the track also especialy when I had the 4l65e.
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