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So this weekend was opening weekend for dove season, so the men of the family take a 4.5 drive to south texas near mexico. Naturally at age 16 I can't stand to drive at 60mph, cause everyone else is 70-80mph. My question is.. is it too tough on the truck to run it at 75-80mph at 2100-2300-RPM's constantly??? the truck acts like it's really wound up. Just curious if i'm damaging my truck or not.
 

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Ones question about rpms. In the cruise section of the manual, it says go change speeds/rpms every now and again. It doesn't give a certain time or speed, it just says to change it up so its not constantly at the same rpm. You guys have any idea what thats about???
 

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As far as the technical reasoning behind it, I'm not sure. But I do know that when it comes to the "break in" period on any engine, it is recommended to not exceed approx 3/4 throttle and to not drive at any constant speed/rpm for extended periods of time.

This conversation sparks another question I would like answered. I don't drive too fast but once on the freeway I decided to see how fast my truck would go. It got into mid 80's and wouldn't go any faster. I wrote it off as the governor, but was curious if everyones does this. Mid 80's is pretty weak. Any way to disconnect or bypass the governor?
 

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mid 80s, thats it? shoot i've been over 100 before, but after that the rpms pretty much max out.
 

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Hmmmmm... It was a long time ago. Maybe I'll try again this weekend on my way down to Dale Hollow Lake. Thanks for the responses.
 

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Just don't be stupid about it. I admit that I like to take risks here and there, try to be safe about it, ie don't do it when other people are on the road or in your truck. Oh, and watch out for the smokey bears, hehe.
 

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not so much as speed limiter but run out of rpms, mine tachs out around 3300 and is a bit above 110 on the clock ive run the truck quite a bit there and can tell you its not a pace to stare at the speedo and see just exactly how fast your moving
 

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I got 95 the other day, but that was around 3100 rpm. Any way I don' t do that any more. I drive for my job, can't afford to get got doing that.
 

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I agree, you're probably fine at that RPM. Although I personally wouldn't do it since it kills your mileage.

One thing I wonder about though - although these engines were designed to be run at or near max rpm for extended periods (think generators, boats, etc), they were certainly intended to have a substantial load on them. If you're running empty, and on flat terrain, to me it's almost like putting the truck in neutral and flooring it. Doesn't seem like a good idea, but that's really just my gut instinct.
 

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I'm not sure about the whole consistant RPMs thing, but I did have problems during a road trip this summer with the CTD 6 speed.

We drove coast-to-coast (west to east) in the 3500HD (no mods, it was loaded with a cover over the bed) for about 18 hours a day at a time (I'd drive about 12 hours, my mom about 6). After about 6,000 miles or 5 days of going a constant 60 to 80mph (2,200 - 2,500 RPM I think), we had a fuel injector give out on us on our way back west. During this time all of the gauges such as engine temp, oil pressure, etc., were reading normal values.

I think that my experiences were unusual and not reflective of what most CTD's would go through at such RPMs, but I wanted to point it out anyways for you to think about.



As for max speeds...I've only taken it to 90 mph on a pass. The only benchmark I have for power/speed would be a 6-7% grade that's 7 miles long that the truck (unloaded) can only just reach 70-75 mph WOT in 6th...and that's when it flattens out for a corner...
 

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All you'll hurt running 2200 rpm is your wallet. A properly tuned engine with proper fluid levels experiences no engine wear. These motors are industrial machines, made to run WOT for many thousands of hours. The harder you work it, the more the motor likes it. :rck: Find the heaviest trailer you can, hook it up, find some heavy stuff for the bed, find a long steep hill, and FLOOR it! As far as the stock differential and driveshafts are concerned.... :help:
 
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