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Old 04-21-2013, 05:01 PM
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How fast do you go...

Just wondering how fast all y'all push your 6.4 when on the highway unloaded and loaded. Any concerns with running speeds over 80mph unloaded for extended periods of time as long as ur watching ur temps?

Unloaded I average 80 mph running some hills and flat and if I get behind a fast group I can run up to 90 mph for as much as 100 miles at a time. I live in charleston, sc so the trips are pretty flat.

When loaded I don't usually run over 75mph for braking purposes.

Only thing that sometimes worries me is when it's summer an 100 deg out my oil temps unloaded running fast get around 209 and coolant 201 with tranny temps sitting round 180.

I have a ccsb, 3.55 gears, 35 Toyo mt, stock height, 20's, fully deleted and run h&s mild tunes 24/7.

I read on here a guy blowing his motor after towing at 120 mph for 100 and something thousand miles before he blew a rocker arm. I was super impressed. He lived on flat land in Arizona or something and ran at night in the desert.

So...how fast are y'all going and how do you feel about it???




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Old 04-21-2013, 05:13 PM
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What RPM's are you running at that speed? With 3.55's I wouldn't worry at all about running 80-90 all day long. If you had 3.73's then you'd be spinning the motor pretty quickly and your fuel economy would suck but it should be fine. 4.10 gears.......let me just say I wouldn't want my truck running at 3k RPM's for hours on end.
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Old 04-21-2013, 05:19 PM
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2k rpms around 80.


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Old 04-22-2013, 08:29 AM
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I "try" to run around at 65mph when I can (highway), to improve fuel economy. If I do have to run I-70, etc, I run 75-80, though my mpg's does drop a bit.


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Old 04-22-2013, 01:37 PM
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62-65mph, gets best mileage there.
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Old 04-22-2013, 01:50 PM
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unless im in a hurry i run 73-75 unloaded to try and conserve fuel. loaded depending on how heavy i range between 60-70. the extra couple MPH does very little in youre ETA unless youre driving LONG distance.

PS- i havnt recalibrated my speedo since i went to these 33s but im 5% slower than the speedo right now so my most fuel effecient speed will be much lower now.
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Old 04-22-2013, 04:44 PM
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I also have 3.55 gears on my 2008 crew cab short bed and run about 2k rpm's at 80 mph. I could run her at the 65-70 mph range and I usually achieve the best mileage, but I could travel 80+ mph all day long on long trips without a problem, that includes hills and flatland.
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Old 04-23-2013, 04:50 AM
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I'll run 80-90 no trailer but after 80 it starts vibrating cause of the wheels. Tow street perf. or extreme doesn't matter.
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Old 04-23-2013, 06:07 AM
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I run usually around 80-85. My bossman usually runs 80-85 also on his 450 with 4.30s whether a trailer is back there or not
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Old 04-23-2013, 05:31 PM
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On freeway empty Im always doing 85 (speedo stuck on 2500). I look so out of place......big o' truck driving like a car .
15 years driving nothing but trucks I could never get used to slower speeds.
Screw ALL em slow drivers......especially the ones on the left lane. They are always unhappy, naggers, retards and inconsiderate. Their thinking of sharing the road is blocking it.
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