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Old May 4, 2004 | 08:35 PM
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390 RPM's

Does anyone know what kind of RPM's a 390 with a C6 and a D60 3.54 on 31x10.5 tires would be runnin at about 65? (It's in a '69 F-250 if that makes any difference) I know there is some long formula because i read it once but I was too young to care and forgot it


Thanks in advance!!!
 

Last edited by jseim44; May 4, 2004 at 09:10 PM.
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Old May 4, 2004 | 09:12 PM
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Who needs formulas?

Try this:
http://www.ringpinion.com/calculators/calcrpm.html
 
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Old May 20, 2004 | 11:37 AM
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www.cvsr.net and go into the games and go to gear heads. this will give you the exact speed and rpm. but you need you tranny gear ratios
 
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Old May 20, 2004 | 01:18 PM
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3rd gear in a c6 is 1.00:1
 
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Old May 20, 2004 | 03:28 PM
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I come up with about 2,450 RPM @65 MPH...
 
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Old May 20, 2004 | 04:36 PM
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i come up with 3680 rpm's at 65 mph with 4.11's, seems high.
 
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Old May 20, 2004 | 04:42 PM
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Fordman but he's running 3.54s
 
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Old May 20, 2004 | 04:46 PM
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4.11s would be about 2,850 @ 65 MPH
 
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Old May 20, 2004 | 04:47 PM
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Have to make another reply... Cant have that 666 up there!!
 
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Old May 20, 2004 | 05:31 PM
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Originally Posted by RapidRuss
Fordman but he's running 3.54s
sorry about that russ i was running my combo, when i typed in 25" tires, 4.11 gears at 65 mph it said 3860rpms.

why didnt you want to see 666 for your # of posts
 
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Old May 20, 2004 | 05:47 PM
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I"ve got a 75 F250 2x4 3/4 ton CS, running a 390 , c6, D60 , my tires are 32"x16, at 65 mph, i"m around 3300 RPMs.
 
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Old May 20, 2004 | 05:50 PM
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There used to be a time when the post counter only incremented once for all your replies in the same thread, it was a lot harder to jack them up back then.
 
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Old May 20, 2004 | 06:07 PM
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Originally Posted by BB
There used to be a time when the post counter only incremented once for all your replies in the same thread, it was a lot harder to jack them up back then.

Hey that wasn't too long ago!
 
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Old May 20, 2004 | 06:32 PM
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Oh..I wasnt trying to get more replies..just that one that had the 3 - 6s on it!

The mark of the devil...... Sorry Guys?
 
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Old May 20, 2004 | 07:56 PM
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I understood what you were doing Russ and completely agree… don’t mess the devil!
 
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