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10-17-2010, 02:58 PM
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#1
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3 Rivet Member
2006 25' Safari FB SE
Livingston
, Full time traveler
Join Date: Jul 2010
Posts: 212
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Cost of switching out rear axle?
Have been looking at 2010 F150 w/ 3.55 and have been told that the 3.73 will be better for towing my Safari (GVRW 7300 lbs.). But, that the 3.73 (hope I have these numbers correct) will reduce my non-towing gas mileage. This matters as my truck will be a daily driver and my only vehicle.
I will tow my trailer only about 2k per year and want to minimize my overall gas costs. But, if the 3.55 (with 5.4 gas engine) proves inadequate, wonder what the cost would be for upgrading the rear axe.
As always, thanks in advance for sharing your experience and knowledge.
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10-17-2010, 03:05 PM
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#2
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A.K.A "THE STREAM"
2010 25' FB International
Arlington
, Texas
Join Date: Dec 2009
Posts: 1,308
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Doesn't make much sense. I have a 2011 F250 with 3.31 rear end and tow my 2010 25' with no worries. Same GVWR. But you are talking f150,..I have a f250.
BUT with the LOWER gear your mileage would actually drop.
Shane
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10-17-2010, 03:20 PM
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#3
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Rivet Master
2005 19' Safari
GLENDALE
, AZ
Join Date: Aug 2004
Posts: 2,453
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You say you "have been told"... Is this by the Ford dealer selling you a new truck? There are a lot of variables that you haven't provided details on:
* Are you buying a 4WD?
* Does it have a "towing package"?
* Will you be driving primarily in the mountains, or commuting to Denver or elsewhere (up- or down-hill) regularly?
Some of these choices may be moot, if you get the towing package; since the engine, transmission, rearend and suspension may be predetermined. Also, you didn't mention which engine you are buying.
In any case, 2,000 miles a year isn't very many miles. If the truck you have chosen is rated to tow the trailer, and it otherwise meets your daily driving needs, I wouldn't change the rearend. However, that being said, you may find that the 2,000 yearly mileage, with your Airstream in tow, may grow in time; if you enjoy it as much as most others on this site. But, living in South Fork, you may not have to drive as far as some of us, to get to the best camping spots -- they are right in your own backyard!
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10-17-2010, 05:08 PM
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#4
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A.K.A "THE STREAM"
2010 25' FB International
Arlington
, Texas
Join Date: Dec 2009
Posts: 1,308
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The lower the number the higher the rear end. I'm learning, also. Which is suppose to equal better MPG. I'm more savvy on the f250, though.
If I can help you in anyway let me know.
Shane
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10-17-2010, 06:04 PM
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#5
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_
.
, .
Join Date: Dec 2004
Posts: 8,812
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Quote:
Originally Posted by HCR
Have been looking at 2010 F150 w/ 3.55 and have been told that the 3.73 will be better for towing my Safari...
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the 3.73 MIGHT result in a tad better acceleration while towing,
and a tiny bit better shifting pattern going UPhill.
but those differences are tiny, probably NOT noticeable to most drivers,
and not worth the $$ price of swapping out a brand new rear end with a factory warranty.
the mpg will be a TINY bit better with a 3.55 if all other driving factors are equal...
and all the other factors r NEVER equal...
the 150 with 3.55 will work fine with a modern 25 footer, save yer money for real upgrades.
cheers
2air'
__________________
all of the true things that i am about to tell you are shameless lies. l.b.j.
we are here on earth to fart around. don't let anybody tell you any different. k.v.
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10-29-2010, 09:51 PM
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#6
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Rivet Master
2005 19' Safari
GLENDALE
, AZ
Join Date: Aug 2004
Posts: 2,453
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I just re-read my post, and I must have had a senior moment. I thought HCR lived in the mountains above Denver. Thus, my comment about South Fork and driving in the mountains.
If you live in Texas, the difference will probably be very little, except for possibly slightly lower fuel mileage.
Quick question (don't mean to hijack this thread): We would like to drive across I-10 to Florida with our granddaughters, to see Disney World; but we've heard it takes 2-3 days to get across Texas. Is that true? I hope I'm not offending any Texans, but is this an interesting drive, or should we consider a more scenic route a little farther north. My wife and I don't mind the drive, but the grandkids need some interesting stops to make that long roadtrip bearable.
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10-29-2010, 10:12 PM
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#7
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Rivet Master
1979 23' Safari
1954 29' Liner
Orange
, California
Join Date: Feb 2005
Posts: 3,850
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I10 across Texas is about 875 miles. The eastern portion, to the hill country, is interesting. The western portion is not very exciting, but then most car scenery for children is not.
Bill
Quote:
Originally Posted by Phoenix
I just re-read my post, and I must have had a senior moment. I thought HCR lived in the mountains above Denver. Thus, my comment about South Fork and driving in the mountains.
If you live in Texas, the difference will probably be very little, except for possibly slightly lower fuel mileage.
Quick question (don't mean to hijack this thread): We would like to drive across I-10 to Florida with our granddaughters, to see Disney World; but we've heard it takes 2-3 days to get across Texas. Is that true? I hope I'm not offending any Texans, but is this an interesting drive, or should we consider a more scenic route a little farther north. My wife and I don't mind the drive, but the grandkids need some interesting stops to make that long roadtrip bearable.
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__________________
Bill Kerfoot, WBCCI/VAC/CAC/El Camino Real Unit #5223
Just my personal opinion
1973 Dodge W200 PowerWagon, 1977 Lincoln Continental, 2014 Dodge Durango
1979 23' Safari, and 1954 29' Double Door Liner Orange, CA
https://billbethsblog.blogspot.com/
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10-29-2010, 11:49 PM
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#8
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Rivet Master
2005 25' Safari
Salem
, Oregon
Join Date: Mar 2006
Posts: 8,378
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Quote:
Originally Posted by HCR
Have been looking at 2010 F150 w/ 3.55 and have been told that the 3.73 will be better for towing my Safari (GVRW 7300 lbs.). But, that the 3.73 (hope I have these numbers correct) will reduce my non-towing gas mileage. This matters as my truck will be a daily driver and my only vehicle.
I will tow my trailer only about 2k per year and want to minimize my overall gas costs. But, if the 3.55 (with 5.4 gas engine) proves inadequate, wonder what the cost would be for upgrading the rear axe.
As always, thanks in advance for sharing your experience and knowledge.
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Hi, here's the deal; With older tow vehicles, with a four speed transmission, I would definately recommend 3:73 gears. And if you have the factory tow package that's what you would get. Now the 2010 F-150 has a six speed trans with completely different ratios and the higher gears are fine in those. Bottom line, you don't need to change gears in this truck. Leave it as is.
__________________
Bob 2005 Safari 25-B
"Le Petit Chateau Argent" Small Silver Castle
2000 Navigator / 2014 F-150 Eco-Boost / Equal-i-zer / P-3
YAMAHA 2400 / AIR #12144
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11-01-2010, 08:06 PM
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#9
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Rivet Master
2006 25' Safari FB SE
Broadway
, North Carolina
Join Date: Mar 2007
Posts: 838
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HCR, you'll not notice a whole lot of difference between 3.55 and 3.73 with an automatic and a 5.4L. I'd say, if you like the truck, get it and start towing!
In my experience, 4:10 gears would however be a nice upgrade eventually. I towed our 25' Safari for quite a while with a 4.2L F-150 before I finally changed out the 3.55 gears for 4.30 (with 33" D/E range tires). Big improvement towing and the gas mileage improved. Daily driving mileage was down a tad but well worth it.
Local speed shop put in Ford Racing gears including a racing limited slip for about $900. Super heavy duty parts.
__________________
2006 Safari SE FB
2000 F150 4.2L (retired), 2011 F250 6.2L, 2010 ML550, 2000 Excursion 7.3L
Broadway, NC
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