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  #1  
Old 04-03-2011, 10:15 AM
pbilt pbilt is offline
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Default high highway rpm or is this normal

i have a 85 ranger 2.3 4*2 the person before me put 3.08 gears in and i got it and put 4.10s in now at 75 its running around 3200 rpm is that normal or is that to high and im about to make a trip from oregon to Minnesota would it be bad to run it at 3200 rpm for 1800 miles
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Old 04-03-2011, 10:19 AM
AlxGry AlxGry is offline
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Default Re: high highway rpm or is this normal

im a little over two at 55 mpg, never really go faster than sixty. The top speed on my truck is 90. They arent meant to go fast man
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Old 04-03-2011, 10:23 AM
pbilt pbilt is offline
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Default Re: high highway rpm or is this normal

damn 55 mpg what mods did you do to get that and i know there no speed demon but the speed limit throu most of montana is 75
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Old 04-03-2011, 10:25 AM
01_ranger_4x4 01_ranger_4x4 is offline
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Default Re: high highway rpm or is this normal

with that gear ratio that is in the normal rpm range for that speed. did you correct your speedo to compensate the gearing change?
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Old 04-03-2011, 10:30 AM
pbilt pbilt is offline
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Default speedo

no the speedo is 12 miles fast but i use the gps for the speed the main question is will 3200 rpm damage any engine parts on a 1800 mile trip
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Old 04-03-2011, 10:39 AM
Twisty Twisty is offline
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Default Re: high highway rpm or is this normal

I don't think that it could cause any damage. You will be putting more hours on the engine.
10 hours at 3000 rpm at 60 mph = 600 miles or 1.8 million rotations
10 hours at 2000 rpm at 60 mph = 600 miles or 1.2 million rotations

Is that math right? Did I miss something?

Do you have the old gears to put back in?
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Old 04-03-2011, 11:17 AM
pbilt pbilt is offline
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Default Re: high highway rpm or is this normal

not sure if the math is right but the numbers look good to me and i am running the 4.10s currently
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Old 04-03-2011, 11:48 AM
Bwad Bwad is offline
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Default Re: high highway rpm or is this normal

I've got 4.10s in a 4 cylinder and am running 3250 rpm at 75.
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Old 04-03-2011, 12:07 PM
djfllmn djfllmn is offline
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Default Re: high highway rpm or is this normal

my 4.0 with 4.10s runs at 2500 at 65mph
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Old 04-03-2011, 01:18 PM
AlxGry AlxGry is offline
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Default Re: high highway rpm or is this normal

i might have guessed a little high, its probably just UNDER 2rpm at 55. Sorry about that
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Old 04-03-2011, 02:06 PM
Twisty Twisty is offline
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Default Re: high highway rpm or is this normal

UNDER 2rpm at 55 - WOW!
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Old 04-03-2011, 02:44 PM
FFSHOKE FFSHOKE is offline
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Default Re: high highway rpm or is this normal

mine is about the same, 5th gear in a manual is great and i got mine to 105....NEVER. AGAIN. lol truck is NOT meant to go that fast lol
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Old 04-04-2011, 06:31 PM
Gumcrew2 Gumcrew2 is offline
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Default Re: high highway rpm or is this normal

I'm running 3.45 rear end with 195/60R15 tires, with a 4 speed. Translates 3000RPM at 60, 4000RPM at 80.

I've had it rev to 6800 ONCE by accident during testing and it actually sounded surprisingly solid, but never under load lol
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Old 04-11-2011, 09:40 PM
Manguchas Manguchas is offline
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Default Re: high highway rpm or is this normal

I can get mine to 110 in forth gear @ 4500rpm. If I put it in 5th it'll start losing speed.
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Old 04-11-2011, 10:23 PM
pooleo pooleo is offline
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Default Re: high highway rpm or is this normal

Yeah that sounds about right for those gears. What size tire you running? My dads ranger we just put in 4.10's and hes running 235's. Im not sure what the rpms are but hes getting about 400/tank. I would look at some larger tires and keep your speed down to keep rpm down. My 4.0 sohc has 4.10's with 235's and it runs at 3100 at 70, I drive it around at about 62 to keep rpm down.
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