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Tractor Talk Discussion Forum

Truck gearing / road speed

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Roy Suomi

05-23-2006 20:23:10




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Howdy,,Looking for a truck geek...I've got a Ford F-600 service truck[ loaded,loaded,loaded ] My problem is this; I need to find out what my road speed will be with this combination; 361 V-8 , 5 speed trans[ not overdrive ]1 to 1, Spicer 7231C auxilliary O.D. transmission with .86 overdrive , 680 rear gears and 40" tall tires [ 10-22.5 ] at lets say 2500 engine RPM.. I need to get a speedo cable for the aux. trans to get the speedo to work..If I can't come up with a cable for it , I can use the tachometer as a speedo in the mean time...

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Roy suomi

05-24-2006 16:40:47




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 Re: Truck gearing / road speed in reply to Roy Suomi, 05-23-2006 20:23:10  
Farmall and Greg , Thanks.....R.S.



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farmall300u

05-23-2006 20:49:54




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 Re: Truck gearing / road speed in reply to Roy Suomi, 05-23-2006 20:23:10  
mph =2500 rpm x (2 pi x r)x (1/.86) x(1/6.80) x 1 mile/(12 x 5280)in x 60 min/1 hr where r = 40/2

I think this is around 50.8 mph.

3500 RPM = 71.18 mph.



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Greg_Ky

05-23-2006 20:44:42




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 Re: Truck gearing / road speed in reply to Roy Suomi, 05-23-2006 20:23:10  
Should be around 50 - 51 MPH at 2500 RPM.
If I had the Circumference of the tire instead of the height of the tire it would be more accurate.



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Greg_Ky

05-23-2006 20:37:54




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 Re: Truck gearing / road speed in reply to Roy Suomi, 05-23-2006 20:23:10  
I"m a little rusty but you should be around 2950 RPM at 60 MPH.



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