Gearing Question
Senior User
Joined: Sep 2011
Posts: 394
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From: Nederland, TX
After re-reading it I missed the part that you have 4.10s and thinking about going to 3.55. If it was me I'd keep the 4.10s as you'll enjoy it more while towing. I didn't see any gains out of fuel millage when I swapped the 3.55 into the 2wd truck.
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Freshman User
Joined: Jan 2012
Posts: 40
Likes: 0
From: Battle Mountain
Fortunatly, as far as trans condition goes, that BD is solid with only 21,000 on it. What is considered top safe rpm for this motor? I can tell you that since new I've never had the truck over 70MPH partly because I dont like seeing such high rpm's in a diesel. Could just be my background, though. I 'm used to big trucks with inline 6's at 1400 rpm. Realy not wanting to change gears if it's not a big difference. Just don't want to get run over on the Nevada freeway.
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Freshman User
Joined: Jan 2012
Posts: 40
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From: Battle Mountain
That sounds easy enough. That's the beauty of these forums. Plenty of people who have dealt with the same thing. Seeing a lot of posts on efuel setups. What does that do besides get rid of that pain- in -the- backside fuel bowl?
Cargo Master
Joined: Feb 2009
Posts: 2,111
Likes: 0
From: Yreka, CA
Check this out:
https://www.ford-trucks.com/forums/1...finitions.html
There's also a lot of good information at the top of the 7.3l category on common mods.
https://www.ford-trucks.com/forums/1...finitions.html
There's also a lot of good information at the top of the 7.3l category on common mods.
Hotshot
Joined: Feb 2009
Posts: 10,408
Likes: 75
From: Plankinton, SD
Don't be afraid to turn some more rpm's with this motor. You could turn 25-2600 + all day long.
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Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
The engine can take it just fine. The occupants are another story.... (esp. the occupant paying for the fuel.)
Hotshot
Joined: Feb 2009
Posts: 10,408
Likes: 75
From: Plankinton, SD
True. I actually had typed that your mileage would suffer, but deleted it. 1-2 mpg is about all you'll lose. At least I only lost about 1 towing. I'm really not sure I lost any, as I can stay in it much better with the 4.10's. EGT's climbed higher and easier with the 3.55's and I'd have to back out on most hills.
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Freshman User
Joined: Jan 2012
Posts: 40
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From: Battle Mountain
Good to know about the rpm limits. I cant help but be a little nervous, I once was standing near one that was over-revved when it came apart. Spooky. I'll just keep it the way it is and just work on some things to bump up efficiency and hp. I'll still take it over a new one. Drive one of those at work and its not near the truck of this one. With the exception of the power at highway speeds. I've probably got more steel in my hood and fenders than that new one has in the whole truck.
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