cruising rpms question
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Cross-Country
Joined: Apr 2012
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cruising rpms question
2007 E450 box truck with 5R11OW transmission and 6.0 powerstroke will not go into overdrive.I drove to dealer and left for repair estimate.Overdrive is shredded,needs reman Trans for 6800.00. I am feeling that is not right,so I am going to go get it and drive to another shop.
My question is what rpms can I safely drive at down the hiway at sustained speed/rpm to get to the other shop?What is maximum rpm,ram, what sustained rpm for 10 to 15 miles can I travel at?
When I asked the service writer he said not over 5000 rpms.I have a hard time believing that.What is the real answer?Thank you.
My question is what rpms can I safely drive at down the hiway at sustained speed/rpm to get to the other shop?What is maximum rpm,ram, what sustained rpm for 10 to 15 miles can I travel at?
When I asked the service writer he said not over 5000 rpms.I have a hard time believing that.What is the real answer?Thank you.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,717
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From: SE Florida
The engine will not run at a speed that is dangerous for the engine. The PCM limits engine speed. If you can get the engine to run at a certain speed, it is safe to do it.'
Does the trans have all other gears? Does it shift 1-2-3-4? Because second gear uses the same overdrive clutch as overdrive gear.
Does the trans have all other gears? Does it shift 1-2-3-4? Because second gear uses the same overdrive clutch as overdrive gear.
Fleet Owner
Joined: Nov 2003
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"Defuel at 4000 rpm's to limit damage to the powertrain" Source : Ford PC/ED manual - page 1-13
I have been told by a Tech that he was taught by Ford Technical that damage can occur at over 4200 rpm (assuming the F450 would be the same as my 2006, and I don't see why it wouldn't be).
Personally I wouldn't risk getting all that close to that rpm.
I have been told by a Tech that he was taught by Ford Technical that damage can occur at over 4200 rpm (assuming the F450 would be the same as my 2006, and I don't see why it wouldn't be).
Personally I wouldn't risk getting all that close to that rpm.
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1973 - 1979 F-100 & Larger F-Series Trucks
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Jun 29, 2011 08:22 AM
