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  #31  
Old 05-31-2011, 08:39 PM
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Quote:
Originally Posted by dkf View Post
Holy rusty undercarrige batman. I take it you bought the truck up north.

Yukon does a fine job packing everything. I'd be interested in hearing if those Yukon gears (for the 10.5") are noisier than the OE Ford gears.(Once they are broken in of course) I've heard the Ford gears are quieter.
OEM gears are quieter! This is not saying the Yukons make a lot of noise just not as quiet as the OEM. The drive side is almost the same...I have a faint whine on the coast side. It's so faint if you have the A/C running or radio on low you can't hear it. I wouldn't let the difference in noise level detour you from purchasing aftermarket gears.
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  #32  
Old 05-31-2011, 09:59 PM
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Originally Posted by Mr-Pipeline View Post
OEM gears are quieter! This is not saying the Yukons make a lot of noise just not as quiet as the OEM. The drive side is almost the same...I have a faint whine on the coast side. It's so faint if you have the A/C running or radio on low you can hear it. I wouldn't let the difference in noise level detour you from purchasing aftermarket gears.
Yukon don't make 10.5" gears. Only 10.25". My rear yukon 4.88s make no noise however, I have run into some pattern issues in the front axle that affect the coast side that make the gearset whine. My drive side is perfect, my backlash is spot on but the coast pattern rides the toe. I will be reshimming to split the difference from the drive to coast side to hopefully quiet it down some.
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  #33  
Old 06-01-2011, 09:25 AM
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One thing to note, my OEM completely-factory rear had a slight whine when very lightly coasting at highway speeds. Loud enough I could hear it pretty easily. Almost sounded like fuel pump, but wasn't.

A few years went by, still did it. Wanting to keep my diff cover from rusting through, I pulled it, sandblasted and painted it, and reinstalled. Refilled with Royal Purple (don't laugh, it was the only thing I could get my hands on at the time that was the correct weight AND synthetic).

Still made the noise.

Diff cover leaked, so had to pull it and reinstall. Lost some of the Royal Purple on the ground, couldn't find it anywhere on the shelf, so figured I would replace it all with Mobil 1.

NOISE IS GONE.

??
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  #34  
Old 06-05-2011, 05:15 PM
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Waiting he see results of MPG as well. I dont own a V10 but looking to maybe buy one in the next couple of months.
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  #35  
Old 06-06-2011, 11:17 PM
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I posted my towing mileage on an earlier post. I haven't moved the truck since returning from our trip to the mountains and not sure when I'll have a chance to get an empty mileage update. Check back in a few weeks...maybe I'll find a reason to put 200 miles on her for a solo mileage update.
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  #36  
Old 06-10-2011, 06:21 AM
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I have a 3v V-10, with the factory 4.30, 315/70R17 and a 4.5" lift.

I don't tow anything anymore, and there are no hills to speak of.

I was actually wishing I had gone with the 4.10's for fuel consumption reasons. Once I get close to 80 mph running down to the coast to go fishing, the computer says I am averaging 6 mpg!?!?!
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  #37  
Old 06-10-2011, 09:37 AM
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Well, 80 is going to kill you no matter what, but 34" tires, compared to stock 31's, and a 4.30 gear is like running 3.90 gears.

I don't think you're going to pick up much in terms of mileage dropping that to 3.73 (which is what 4.10's with 34" tires would be like with stock tires).

Something else, fuel delivery wise, might be going on.
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  #38  
Old 06-10-2011, 09:43 AM
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Quote:
I was actually wishing I had gone with the 4.10's for fuel consumption reasons.
I'd bet money the mpg difference would not be noticeable.
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  #39  
Old 09-28-2011, 09:06 PM
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UPDATE

***Fuel mileage running empty***

I finally had a opportunity to run a fuel mileage test with my new 4.56 gears. The trip was a total of approximately 300 miles requiring refueling, giving me a full tank to calculate my mpg. The terrain was mostly flat and winds were light. The majority of the trip I was running 75 mph at 2,600 rpm, with a few small stretches of city driving. I did have 1 full throttle high speed pass that took the F350 up to 90 mph . I'm also running the 5-Star 91 performance tune. My average for the 1 tank was 11.6 mpg. I LOVE the 4.56 gears!!!
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  #40  
Old 09-29-2011, 04:09 PM
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  #41  
Old 11-21-2011, 10:30 AM
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[quote=Mr-Pipeline;10863256]UPDATE

***Fuel mileage running empty***

I finally had a opportunity to run a fuel mileage test with my new 4.56 gears. The trip was a total of approximately 300 miles requiring refueling, giving me a full tank to calculate my mpg. The terrain was mostly flat and winds were light. The majority of the trip I was running 75 mph at 2,600 rpm, with a few small stretches of city driving. I did have 1 full throttle high speed pass that took the F350 up to 90 mph . I'm also running the 5-Star 91 performance tune. My average for the 1 tank was 11.6 mpg. I LOVE the 4.56 gears!!!

UPDATE #2

***Fuelmileage running empty at 80 MPH***


During a campout this past weekend our Scout Troop traveled from Junction Texas to Sonora Caverns 72 miles away, 142 round trip. This stretch of I-10 speed limit is 80 MPH so I filled up before jumping on the interstate and filled up again when we returned. When I calculated the fuel mileage I was surprised that I got 11.4 MPG! Traveling 80 MPH I’m turning 3000 RPM and thought my mileage would take a big drop. For those thinking gears will kill your mileage…not the case. As I said before…I LOVE my 4.56 gears! Oh yes, I had the pleasure of towing a fellow camper's Chevy P/U home after it broke down on the return trip. Yes, I did get a picture, I’ll post that later today.
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  #42  
Old 11-21-2011, 10:33 AM
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[quote=Mr-Pipeline;11062198]
Quote:
Originally Posted by Mr-Pipeline View Post
UPDATE

***Fuel mileage running empty***

I finally had a opportunity to run a fuel mileage test with my new 4.56 gears. The trip was a total of approximately 300 miles requiring refueling, giving me a full tank to calculate my mpg. The terrain was mostly flat and winds were light. The majority of the trip I was running 75 mph at 2,600 rpm, with a few small stretches of city driving. I did have 1 full throttle high speed pass that took the F350 up to 90 mph . I'm also running the 5-Star 91 performance tune. My average for the 1 tank was 11.6 mpg. I LOVE the 4.56 gears!!!

UPDATE #2

***Fuelmileage running empty at 80 MPH***


During a campout this past weekend our Scout Troop traveled from Junction Texas to Sonora Caverns 72 miles away, 142 round trip. This stretch of I-10 speed limit is 80 MPH so I filled up before jumping on the interstate and filled up again when we returned. When I calculated the fuel mileage I was surprised that I got 11.4 MPG! Traveling 80 MPH I’m turning 3000 RPM and thought my mileage would take a big drop. For those thinking gears will kill your mileage…not the case. As I said before…I LOVE my 4.56 gears! Oh yes, I had the pleasure of towing a fellow camper's Chevy P/U home after it broke down on the return trip. Yes, I did get a picture, I’ll post that later today.
Sounds like the exact same experience I had back in march. I made the run from Beeville back to Beaumont following a BMX SUV and an Audi sedan, and we were running...we'll say well north of 80 mph and the hand calc'd mileage for that run was 12.2.
It's all about getting the engine into it's max efficiency range of RPM.
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  #43  
Old 05-29-2013, 09:43 AM
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Resurrecting an old thread...

I was doing some more searching and Google'ing on gear swaps last night.

Mr. Pipeline: you still loving your 4.56? Having owned them for a few years now, anything you wish you would've done differently? That is, do you ever find yourself wishing you would've gone with any other ratio? 4.30, 4.88?
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  #44  
Old 05-31-2013, 04:02 PM
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No regrets what so ever! I’m getting ready to replace my tires and plan to increase tire size from 33 to 35, the 4.56 were just a touch too much for 33…so the 35 should be perfect. I’m turning 2,500 RPM’s at 70 in OD empty and tow at 2,100 RPM at 62 in OD. When I hit a hill it drops out of OD, hits 3,000 RPM’s and pulls strong. You will see your mileage drop running empty, however if you own a F-350 V-10 you shouldn't have mileage high on your “want” list. I’m considering installing air lockers for a future project.



Quote:
Originally Posted by truckfella View Post
Resurrecting an old thread...

I was doing some more searching and Google'ing on gear swaps last night.

Mr. Pipeline: you still loving your 4.56? Having owned them for a few years now, anything you wish you would've done differently? That is, do you ever find yourself wishing you would've gone with any other ratio? 4.30, 4.88?
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  #45  
Old 06-02-2013, 03:36 PM
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Thanks for the update.

So based on your above statement, sounds like you're saying that IF you were to stay with 33" tires, 4.56 are geared a little too low for your truck's towing/hauling duties?
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Old 06-02-2013, 03:36 PM
 
 
 
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