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post #1 of 5 Old 06-21-2011, 08:44 AM Thread Starter
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highway speed rpms

Ok this is kind of a concern question vs a problem. But in my dually I have 4.10 gears with lsd from the factory. Now when I'm going down the highway at around 60 mph I'm at 2300 rpm. There's been times where ill catch myself doing 75 and I'm nearing 2700 rpm. Will cruising at those rpms be damaging to my motor since the redling is 3400? I ask cuz I really love the truck but the high rev highway speeds have me worried and d like to get others opinions on any long term or short term damage this could cause or if its perfectly fine to do.
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post #2 of 5 Old 06-21-2011, 11:10 PM
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nope these motors can sit revving all day.. wont hurt a thing... sure sucks the fuel down though.. im glad i got 3.73's
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post #3 of 5 Old 06-22-2011, 05:40 PM
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I have a dually with 4.10 gears and at 60 mph i am turning just at 2000rpms. I wonder why you are 300 rpm higher than where i am at. I am running the stock size tires with a auto.

00' F350 Lariet, CC, 4wd dually, 7.3L, diy intake, superchips, autometer gauges, 4" diamond eye.
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post #4 of 5 Old 06-22-2011, 05:55 PM
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We'll need to know your engine and transmission and tire size.

I have the 6.0L with the 5R110 DRW on stock tires, and run 4.30 gears and hover just over 2,000rpms at 60 mph.
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post #5 of 5 Old 06-23-2011, 04:33 AM Thread Starter
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Sorry. The motor is a 7.3. Truck is a 95 CCLB dually. Tire size is 245 85 16. Tires are about shot. And trans is a E40D with bully dog shift kit new rebuild and an ats 3 clutch tq converter. After another look I am def around 2250 rpm at 60 mph. I double checked the rear again and it is infact 4.10 with a limited slip differential( the lsd shouldn't affect the result however). My truck runs flawlessly and shifts even better. Just seems my rpms are high. Here's another question then. My converter will be locked and in 4th gear by 35 mph if I'm light on the throttle. Does that seem odd? Doesn't to me but a friend commented about how fast it shifted.
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