6.4L Power Stroke Engine and DrivetrainDiscussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008 Super-Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.
My F450 RPM guage does not have a reline like my Duramax. With the Dmax I believe my top RPM before the redline was about 3300---whats the story with the Ford?
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2008 F-450 Lariat Black over Silver, Med Gray Leather, Automatic, High capacity tow 4:88s, 200A Alt, Nav System, Sirius Sat, Upfitter switches, Moonroof, backup camera, tailgate step, traction control, Audiophile 6-disc, heated seats, rear sensors, tailgate step.
2007 Teton Experience Sunrise 33 (5th Wheel)
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: peterspca90732</div><div class="ubbcode-body">My F450 RPM guage does not have a reline like my Duramax. With the Dmax I believe my top RPM before the redline was about 3300---whats the story with the Ford? </div></div>
I don't know precisely what the red line is but I do know that the F-450 is speed limited to 80-85 mph, so whatever rpm that is is the max the PCM will allow. As far as ungoverned redline, I don't know. They probably do not have a redline since the PCM will not allow you to "redline" it so what's the need.
4000 MAX (Red Line), 3700 RPM Max Governed Speed (Page 6 of the Diesel Supplment book.) You can over rev one by downshifting at to high a ground speed or gearing down on a downhill run using the engine for braking.
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Y2K excursion XLT 2wd, ordered july '99, built august '99, delivered september 9 '99, 4R100 fried & replaced at 900 miles still running like a champ
I didn't think you could over rev an automatic by downshifting as it won't downshift until it is slowed nough not to over rev. Not sure if we were talking manuals or automatics.
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2007 F350 Lariat CC SWB 4X4 SRW Torque Shift. True Blue with Medium Flint. 20 inch wheels, FX4, Moonroof, sliding rear window, Tow Command, dual alt's.
The computer won't let the automatic downshift if it will overrev the engine. You can put the shifter in 1 at any speed, but it won't shift to 1 until it reaches a speed that it can make the shift without damaging anything.
__________________ Mark
Former Automatic Transmission Engineer 1988-2007
I assume you are talking manual tranny here. You CAN over rev the engine, but in my experience, you would have to be an idiot. If you accidentally attempt to grab the wrong gear, you will find that it will be very hard to force it into the undesired gear. Both manuals I have had have been great- very smooth shifting. If it fights you at all, you need to re-think your gear selection.
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Red 2002 F-350 XLT SRW 4x4 7.3L reg. cab 6-speed rubber floors traded at 50K for:
Red 2005 F-350 XLT SRW 4x4 6.0L reg. cab 6-speed rubber floors BFG 12.5x35 mud-terrains, no lift traded for:
Red 2008 F-350 XLT SRW 4x4 6.4 reg. cab 6-speed. Got carpet this time- audiophile stereo deletes rubber floors. BFG 12.5x35 mud terrains, no lift.
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