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Old 04-20-2016, 01:16 PM   #11
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Originally Posted by bpadamson View Post
We pull a TH, close to 10,000 fully loaded with our Ford. It loves the flat and pulls like a dream. Out in our country of course there are those steep places between the short flat roads. I am in 4th over every hill. But when you think about the tranny, 5th and 6th are both OD so I don't have too many issues. We went to the west coast and Yellowstone last summer. With 3.73 and oversized tires I am not geared as well as stock. Am looking at the 4.30 this summer as a change out. i have the SCT chip and run 91 octane, empty over 16mpg if I don't play with the go peddle.
Great info! Since I'm driving empty about 90% of the time, would you suggest getting the 3.73, rather than 4.30? If I get oversize tires, they probably wouldn't be much larger than stock.

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Old 04-20-2016, 04:38 PM   #12
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The 4.30 Rear End.
How much better would it be than my 3.73? (Better gas mileage, power, torque. All of the above?)
How hard would it be to change out? And for how much?
Just a few questions I'm sure someone can answer.

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Old 04-20-2016, 05:03 PM   #13
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Check with Ford first if warranty would allow the change. You don't need the 4.30's with your trailer anyway. From what I can tell from the Forest River website your GVWR will be in 7800 lb area. Even if it was a 1000 lb more than that the 3.73's will be just fine.

2010 F250 5.4L 3.73
2011 Flagstaff 831FKBSS
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2011 Flagstaff 831FKBSS
2010 F250 4X4 5.4L 3.73 LS
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Old 04-20-2016, 05:14 PM   #14
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Just as an aside, have you looked into a lightly used Powerstroke as an option? I went from a tuned and deleted 6.4 Powerstroke( reluctantly ) to a used 6.7 and was worried about the DEF. It's not a big deal at all.
2013 Ford F-350, FX4 ,Long Bed, 6.7 Diesel, 11500# GVW package, camper package, plow package, Electronic locking 3.73 rear end.

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Old 04-20-2016, 05:38 PM   #15
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I have a new F250 6.2L V8, 4x4, with 3.73 rear and stock all-terrain tires on the 18" rims

I get 12.5 mpg on average unloaded (mixed city/highway), and 8-9mpg towing a 9000lb (loaded) 5er (on the flats to low hills).

I haven't towed on any real terrain yet, but will be going over the rockies (several times) in June/July. Obviously a naturally aspirated engine isn't going to do so well in the higher altitudes, so it should be an adventure
2015 Rockwood Signature UltraLite 8281WS
2016 Ford F-250 Lariat CrewCab, 4x4, 6.2L V8
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Old 04-20-2016, 05:56 PM   #16
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3.73s work great for my 8k lb trailer. I even had my truck built and decided to stick with the 3.73. There are a few times a year where I drive the truck without the TT from Virginia to Louisiana and back and I didn't want 4.10s to make that run.
Lee and Anne

2016 F250 2WD CC SB XLT 6.2 3.73 3,295 lb payload cap.
2014 Salem Hemisphere 282RK 8k lbs loaded, Equal-i-zer WDH, TST 507 TPMS
2017: 4 nights camped, 12 booked
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Old 04-20-2016, 05:59 PM   #17
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I pulled my fiver on an 8000 mile trip with a 2011 F250 and for about 50% of the trip it was OK. Mountains out west and in Montana were a struggle having to go to first gear on some occasions.
Pulling a lighter TT with less wind resistance should be better. Mileage was around 13 average with no load. 7-8 while towing.
Traded it for a 2013 Duramax 2500 and mileage is 19-22 and 10-12 towing. Difference in performance is unbelievable.

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Old 04-20-2016, 07:16 PM   #18
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We pulled out old camper thru TN mountains and all over with 2011 6.2 SD 3.73 and with it loaded we ran 8 MPG. On flat ground we got 9. Loaded we were about 6500lbs. Wouldn't have traded it for a diesel for nothing, plenty of power. We just pulled our new camper for the 1st time at about 9000 lbs and it works harder on the hills but still I was very pleased. Averages 1800-2200 rpm most of the time and even under 3500 on most hills. Where you notice it is when your getting on the on ramp and you need that boost, not like it was at 6500lbs... But again I'm still very pleased. Oh yea, 13.5 MPG not towing and it doesn't care if hwy or back roads 13.5 is the best she will do.
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Old 04-20-2016, 08:26 PM   #19
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My dealer said if I wait till warranty is out, then it is 3 more years of warranty on the gears and bearings. If I change out during warranty, it is out at 3 yr/ 36000miles. Cost quoted to me is $3k for a 4 wheel drive. If you check the specs it adds more carrying capacity and torque of course. I seldom use 6th speed since I am not on the Interstate much unless we are traveling, if I put the gears in I imagine I will get to use 6th more. I have about 800 to 1000 lbs margin with the TH now. If you want more than that or load heavier toys, then at least 4.10s should be considered. imho, and I am still considering...

9.5 year old FR Cherokee 295 WP 32' toyhauler
2013 Ford F250 SD CC 4X4 4.30 gears
Tuned-- engine, music, and exhaust,
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Old 04-20-2016, 10:06 PM   #20
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This is great info from all. In one form or another I had all my questions answered. Thanks to all.
I guess the best thing to do up front is get the trailer hooked up and see how she performs. Most of the towing I will be doing is going to be on fairly flat ground except for a trip west in June. Even then it will be I-40 for the route. A few bumps in the road there but no major grades.

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