351m rpm's
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351m rpm's
I bought a 77 f250 crew cab with a 351m(currently not running) I have 4.10 gears can anyone tell me what rpms the engine is turning in 4th gear at 55-65mph on the highway. thanks chuck
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Joined: Feb 2001
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351m rpm's
I have a formula below that will get you close to what you need to know.
RPM=(168 x MPH x R(t) x R(a))/t(r)
R(t)= transmission ratio
R(a)= axle ratio
t(r)= tire rolling radius
168= constant
In your case RPM=2296 @ 55mph, & 2713 @ 65mph
Fordy
1978 F-250 Custom
RPM=(168 x MPH x R(t) x R(a))/t(r)
R(t)= transmission ratio
R(a)= axle ratio
t(r)= tire rolling radius
168= constant
In your case RPM=2296 @ 55mph, & 2713 @ 65mph
Fordy
1978 F-250 Custom
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