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03-31-2012, 08:14 PM
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#1 |
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Registered User
Join Date: Jul 2011
Location: vacaville ca
Posts: 1,304
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my RPM's at 60 MPH
So got that tach in the truck today and went down the road.. Seems I a seeing 3000 RPM at 60 MPH. I am running 255-60-15 rear tires (almost new). The speedo may be a tad off so will verify with the GPS tomorrow because it started raining.
I also need to verify the rear end ratio. I thought I had 3:73 gears, at least that is what we figured out when we measured a full rotation. What do you all think.... anybody figure out my rear end ratio by RPM and Tire Size vs speed. If the speedo is off it is by only a couple MPH...
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04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP SOLD 1972 chevy c10 |
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03-31-2012, 08:22 PM
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#2 |
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Newbee
Join Date: Jan 2010
Location: Phoenix, Arizona
Posts: 1,406
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Re: my RPM's at 60 MPH
I have 33" tires with 3.73's, TH400, and turn 2600ish at 60MPH. So I'd say you have a 3.73.
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03-31-2012, 08:29 PM
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#3 |
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Registered User
Join Date: Jul 2011
Location: vacaville ca
Posts: 1,304
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Re: my RPM's at 60 MPH
wondering what would be a nice fat tire on the rear to bring that rpm down some when driving that would give a nice fat rod look on the rear...
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04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP SOLD 1972 chevy c10 |
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03-31-2012, 08:39 PM
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#4 | |
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Registered User
Join Date: Jul 2007
Location: Left Coast,Canada
Posts: 294
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Re: my RPM's at 60 MPH
Quote:
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03-31-2012, 08:41 PM
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#5 |
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Newbee
Join Date: Jan 2010
Location: Phoenix, Arizona
Posts: 1,406
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Re: my RPM's at 60 MPH
You will have to go taller with the tire, OD trans, or Gear vendors overdrive. It is much cheaper to just change gears.
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03-31-2012, 08:58 PM
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#6 |
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Registered User
Join Date: Jul 2011
Location: vacaville ca
Posts: 1,304
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Re: my RPM's at 60 MPH
sideways, thats the tire look I want for the rear
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04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP SOLD 1972 chevy c10 |
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03-31-2012, 09:06 PM
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#7 | |
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Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: my RPM's at 60 MPH
Quote:
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Fuzzy |
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03-31-2012, 09:07 PM
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#8 |
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Registered User
Join Date: Jul 2007
Location: Left Coast,Canada
Posts: 294
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Re: my RPM's at 60 MPH
Another option is Michelin LTX ms, they have a 30-9.50 and would go on a 8" rim nicely.
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