rpm?
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New User
Joined: Feb 2011
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rpm?
I just bought an 02 5.4 SC FX4 and had it on the highway last night and it was around 2000 rpm's at 70mph . I kept waiting for another shift but it stayed there. Didn't sound like it was reving to hard but just thought it should be closer to 1500 to 1700 rpm's at that speed. I have 285/70 BFG's for tires. Is that the normal rpm range or should I look into it more? Thanks for any help. I am going to be towing a golf cart for 12 hours on Thursday so checking with the experts to see if the truck is running ok.
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That's what I was wondering! I didn't ask before I bought it!!
I bought it from a private party and it was a lady who was a one owner and the car fax didn't mention anything about a gear change. Are the 3.55's what came stock on the 5,4 FX4's?
I bought it from a private party and it was a lady who was a one owner and the car fax didn't mention anything about a gear change. Are the 3.55's what came stock on the 5,4 FX4's?
Post Fiend
Joined: Jan 2007
Posts: 7,021
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From: Almost Heaven
Hmm. Have you tried looking on your pumpkin to see if there's a metal tag on one of the bolts? It would tell you exactly what you have. Short of that you could look inside your door jam sticker and get your axle code. Post it up and see if anyone can decode it for you.
Honestly though, 2,000 doesn't sound like much. Not on a modular V8. I highly highly highly highly doubt you have anything at all to worry about.
Your gear ratio isn't going to be extremely low. I doubt it would be any lower than 3.73.
Your tires are factory size, correct?
Honestly though, 2,000 doesn't sound like much. Not on a modular V8. I highly highly highly highly doubt you have anything at all to worry about.
Your gear ratio isn't going to be extremely low. I doubt it would be any lower than 3.73.
Your tires are factory size, correct?
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Not sure what size tires come w/ stock. These bfg's are 285's so I figured they would be a little bigger and keep the rpm's down a little. I will look at pumpkin tomorrow and see what's there. So far the truck seems to be running well for having a 117k on it.
Post Fiend
Joined: Jan 2007
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From: Almost Heaven
Well keep me updated please, I'm curious. I bet you have 3.73's if you're running two grand with taller tires than stock.
I have 31x10.5's and run 2,200 RPM at 60 mph. Different engine but gives you an idea.
I have 31x10.5's and run 2,200 RPM at 60 mph. Different engine but gives you an idea.
Posting Guru
Joined: Mar 2009
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From: Montague, NJ
that would be 3.55 rear. mine does the same with almost the same size tires. its perfectly normal.
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Post Fiend
Joined: Jan 2007
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From: Almost Heaven
Don't listen to Louis, he doesn't have a CLUE what he's talking about. 
Just kidding. Louis is a great guy and very truck smart!
Just kidding. Louis is a great guy and very truck smart!
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Post Fiend
Joined: Jan 2007
Posts: 7,021
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From: Almost Heaven
That's just the way the entire forum is going, man. Even in the 300 I6 section it's dead for the most part. And that's saying something.
The "other" forum has been dead for a long time now. I'm not sure how long but a while.
I hope it's just a phase. Come on people, start breaking your trucks! haha.
The "other" forum has been dead for a long time now. I'm not sure how long but a while.
I hope it's just a phase. Come on people, start breaking your trucks! haha.
