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Old 12-01-2012, 09:28 AM
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Please analyze and give me your thoughts

Bought yesterday in Georgia and drove up to Detroit. Take a look below and give me some help, please.

2007 f350 Dually 4x4

39k miles

Deltas at 60 mph are 8
Deltas at 75 mph are 12

Engine hours are 1061, is this high, low???

Fuel mileage is 14 hand calculated all freeway at 70-75mph. Why so low?

Also, vibration at 75 mph and higher, really bad, thoughts??


Thanks in advance,
Keith
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Old 12-01-2012, 09:40 AM
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Looks great, need a tire balance. That sounds like a nice truck! People are going to say you need a new engine because you get 14mpg!-lol. Just take it with a grain of salt, they are full of it. Driving style and speed have the most effect. Your on winter diesel now to which reduces it a bit.
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Old 12-01-2012, 09:49 AM
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Good luck with it
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Old 12-01-2012, 11:10 AM
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Quote:
Originally Posted by Pwraddr View Post
Bought yesterday in Georgia and drove up to Detroit. Take a look below and give me some help, please.

2007 f350 Dually 4x4

39k miles

Deltas at 60 mph are 8
Deltas at 75 mph are 12

Engine hours are 1061, is this high, low???

Fuel mileage is 14 hand calculated all freeway at 70-75mph. Why so low?

Also, vibration at 75 mph and higher, really bad, thoughts??


Thanks in advance,
Keith
Everything looks good so far.

Your wheels are most likely out of balance, so get them balanced and that vibration should go away.

But it also depends on the road and the length of your truck.

If you have a crew cab with a long bed (CCLB) and you are driving on concrete slab roadways, at 70-75 you will get strong vibrations/bouncing/shaking because of the length of the truck being the same as the length of the slab joints.

So you kinda fall into the joints at the same time or within close proximity, shaking the hell out of the truck.

It could also be your tires if they have an aggresive tread.

So there are a couple of things it could be, but start with the balancing.

It's also very good that you are monitoring the engine right off the bat.

You're ahead of the game!
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Old 12-01-2012, 11:30 AM
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Get a coolant filter on there, good job monitoring. I wouldnt worry about the deltas now. Keep monitoring.

Sent from my phone that somebody didn't help me get.
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  #6  
Old 12-01-2012, 11:43 AM
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Quote:
Originally Posted by southend View Post
Get a coolant filter on there, good job monitoring. I wouldnt worry about the deltas now. Keep monitoring.
I agree; I forgot to mention that.

I got side tracked talking about the road! LOL
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Old 12-01-2012, 12:00 PM
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Your fuel mileage may be lower if you have the tow boss package which has 4.3 gears. My truck got the same until I put a performance tune on it. Good luck with your new truck!

Sent from my Atrix
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Old 12-01-2012, 12:11 PM
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Ok, rather than multi quoting....

Truck has 4.11, not 4.30 that the tow boss has.

It is a crew cab long bed.

Tires are Michelin and pretty new, no vibration until the higher speeds....I thought maybe the mid shaft bearing on the driveshaft??? Are they common??

The monitoring I learned here, thank you all for the tip, I've learned a lot here.

I plan to purchase the IPR coolant filter....seems like most here think it is the best. Only question is should I buy the manifold too??

Im totally shocked about the mileage....is 14 on the freeway really the norm??.

I plan on using it to pull my offshore, around 6.5 tons.

Thanks again!!
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Old 12-01-2012, 12:15 PM
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Running 70MPH with 4.10s gets you up near 2.2k RPM, right? Or more.
After 2k, mileage goes bye bye. Drive right around 63 MPH and right at 2k RPM, you'll do a lot better.
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Old 12-01-2012, 12:17 PM
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Quote:
Originally Posted by jesilvas View Post
Running 70MPH with 4.10s gets you up near 2.2k RPM, right? Or more.
After 2k, mileage goes bye bye. Drive right around 63 MPH and right at 2k RPM, you'll do a lot better.
Yes, the RPm was is that neighborhood. Thanks for tip.....but who wants to drive 63??? LOL.
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