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what rpm

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Old Jan 19, 2007 | 09:06 PM
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what rpm
does anyone know what rpm a f250 w/ 351 a c6 and a 3.55 rear end is running at 60 mph. my truck does not have a tach and it sounds like it is running pretty high. could be or it could be the fact there is no exhaust past the cat.

thanks
 
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Old Jan 19, 2007 | 10:18 PM
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Punch the numbers in here...

http://www.csgnetwork.com/rpmcalc.html
 
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Old Jan 20, 2007 | 07:00 AM
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cool, can you tell me what the gear ratios are for the c6?

thanks
 
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Old Jan 20, 2007 | 07:04 PM
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need tire size, but should be around 2800 rpm. my f-150, 302/aod, 3:55's and 235's turns 3000 rpm @110 km/h ....

the c-6 is 1:1 in 3rd gear
 
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Old Jan 20, 2007 | 07:15 PM
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it is running 235/85-16 but i can believe 2800 rpm thanks
 
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Old Jan 20, 2007 | 09:00 PM
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they'd be a lil' taller then mine, and would drop your rpms a bit, 2800 is a guestimate, but should be close
 
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Old Jan 20, 2007 | 09:30 PM
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Originally Posted by p.j.
it is running 235/85-16 but i can believe 2800 rpm thanks
Those tires should be about 31.5" tall and that puts you at 2275rpm at 60mph.
 
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Old Jan 21, 2007 | 07:58 AM
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thanks

it sucks not having a tach both my 88 150 and now this did not have one.
 
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