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Old 03-02-2004, 11:59 AM   #1
flip66
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What gears are you running

I am not sure what gears I have but I have a set of 3:73 I was thinking of using. I was talking to someone that has 3:73 and he said when he's going about 60 MPH he is turning about 3000 RPM. He has a 350 with a 350 trans I have a 396 with a 400 trans. I can run at 70 MPH and run at about 3000 this leads me to believe I may have 3:08 but again I am not sure what my gears are.

Can any of you guys out there tell me what RPM you are running at 60 MPH and what gears you have.
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Old 03-02-2004, 12:08 PM   #2
Oborny71
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here you go.

http://www.smokemup.com/auto_math/rear_end.php
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Old 03-02-2004, 12:09 PM   #3
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sorry , i guess you need to be registered to that site. worth doing though. they have very good auto math calculators.
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Old 03-02-2004, 12:13 PM   #4
70cst
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Hey Flip66...
My 70cst has a factory 402BB with the 400 tranny...the stock rear end was a 3:08 and I have installed a 3:41 (?) posi. I'm not sure what rev's I'm running. Next time I get her out I'll check out the RPM's.
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Old 03-02-2004, 12:20 PM   #5
Bill72BB
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Here is a site that may help.

http://richmondgear.com/streetcalculators.html

I'm running 3.54 with 32.5" tires
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Old 03-02-2004, 12:32 PM   #6
SWEET7T
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I have 3.08's from the factory and I'm turning 3g's at ~80.

Flip, your going too slow to have 3.08s, sounds more like 3.54 or (were 3.31's offered in these trucks?!?! )
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Old 03-02-2004, 12:34 PM   #7
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plug in the numbers and you should get a good idea..


http://www.angelfire.com/fl/procrastination/rear.html


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Old 03-02-2004, 02:16 PM   #8
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In my '96 that has 3.42 ratio I am running about 2800 to 2900 RPM at 70 MPH when in drive. I am running 235/75/15 tires.

Randy
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Old 03-02-2004, 03:00 PM   #9
flip66
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Thanks guys I have to make sure on the RPM but it looks like they may 3:73 already.
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