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Rpm's/mph?

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Old May 4, 2006 | 11:48 PM
  #1  
klaw37's Avatar
klaw37
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Rpm's/mph?

Hi guys I have a F-350 2x4 diesel, auto trans, drw, I'm turning 2100/2200 rpm's at 65 mph? is this right? od is on. Seems high to me?
 
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Old May 4, 2006 | 11:59 PM
  #2  
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mwpierson
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Welcome to FTE klaw37!

Is this a new truck? V10 or PSD? Does it have a 4.10 rear gear? That RPM:MPH sounds about right for a V10 with a 4.10.

Find out what gear you have and the tire size then google "rpm calculator". You will be able get an approximate calculation.

Mike
 

Last edited by mwpierson; May 5, 2006 at 12:02 AM.
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Old May 5, 2006 | 12:27 AM
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ryaneverk2
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Is yours a 7.3L or 6.0L PSD?

If it's a 7.3, with the dually you've most likely got 4.10s, so your numbers are right about where they are for most folks.
 
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Old May 5, 2006 | 04:51 AM
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m350
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My 06' F-350, PSD,TS, w/3:73 rears, tach reads 1900 rpm at 70 mph, thats with 18" wheels too.

If I recall correctly my V-10, 6-speed with 4:30s was around 2250 rpm's or so at 70 mph.
 
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Old May 5, 2006 | 07:11 AM
  #5  
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DetailerDave
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From: Phoenix, Az
My bone stock F-250 turns 2000-2100 at around 70 mph. 3.73 gears.
 
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Old May 5, 2006 | 12:08 PM
  #6  
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klaw37
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Question

Sorry guys, its a 99 7.3L, dually, automatic. I was pulling a little motorcycle trailer about a 450 mile trip and got 12.5 mpg! with the cruise on! is this all I can expect? this is my first 1 ton, been driving big trucks for 20 yrs. It's got a 4" wide open exhaust also.
 

Last edited by klaw37; May 5, 2006 at 12:11 PM.
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