Rpms with 3.90s

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Aug 12, 2004 | 06:18 PM

Breeze

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From: Md

Rpms with 3.90s

I have an 03 sillverado 5.3 auto 2wd I want to have 3.90s installed also. How many Rpm will I be turnin at 75 mph my tires are p255 - 70 - 16.

Aug 12, 2004 | 06:36 PM

Kano

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From: Winston Salem NC

5310rpm in 2nd
3268rpm in 3rd
2277rpm in OD

Aug 12, 2004 | 07:13 PM

Breeze

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From: Md

Thats not to high .I dont mean to be a pain how about 4.10s?

Aug 12, 2004 | 08:21 PM

WaitinToDrag

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cruisin at 80mph...im hittin 2400-2450rpms

Aug 12, 2004 | 08:57 PM

Breeze

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Quote:

Originally Posted by WaitinToDrag

cruisin at 80mph...im hittin 2400-2450rpms

Are you runnin 4.11s with stock size tires

Aug 12, 2004 | 09:40 PM

slowprocess

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From: Cleveland Mississippi

I have heard the formula is Gear Ratio x mph x 336 / tire ratio = RPM

Quote:

Originally Posted by 03silverado5.3

I have an 03 sillverado 5.3 auto 2wd I want to have 3.90s installed also. How many Rpm will I be turnin at 75 mph my tires are p255 - 70 - 16.

Aug 13, 2004 | 03:39 PM

Breeze

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From: Md

Are you sure im turnin 2100 at 75 with my 3.42s

Rpms with 3.90s

Rpms with 3.90s

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