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Old 04-21-2015, 01:31 PM   #1
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Engine and axle combos.

Ford offers the max trailer tow pkg. with a 3.5L ecoboost eng. and couples it with a 3.55 rear drive.

Has anyone had experience with this pkg.? I am more accustomed to a ratio of say 4.10 or 4.30 and was just curious as to the results obtained.


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Thank you.
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Old 04-21-2015, 02:39 PM   #2
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Transmissions are different today. The overall ratios forr the six speed plus trannys are pprobably the same as for the old four speeds. So a 355 nay have the same overall towing ability as a 411. What do all the rest if you say. Peace,jim
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Old 04-21-2015, 03:01 PM   #3
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I would think 3.55 rear ratio is rather tall, for pulling no matter what. I have 2000 chev. silverado 2500 6.0 with 3.73 set up for trailering slide in camper etc. This rated at 8000 lbs. GVW. I never have trouble or engine laboring when towing. AS. And excavating equip. most run 10,000 lbs. or more, also I think any thing over 4.00 ratio is over kill unless small horse power. I am not engr. but have towed for over 60 yrs. & never abused eng. or had failures. I have also have heavy duty trannys for pulling. I will say my neighbor has 2013 Ford 150 ecoboost, pulls wells cargo 20ft. enclosed trailers with mowers etc. with out any probs.But I don't no the rear ratio she has. If any 1 that has setup you wrote will chime in give there opinion.
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Old 04-21-2015, 03:03 PM   #4
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I have a 2014 F150 with 3.5L Ecoboost with the "Electronic locking 3.55 rear axle". Have towed my boat a short distance with no issues. Plan to tow the AS next weekend.
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Old 04-21-2015, 04:45 PM   #5
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Quote:
Originally Posted by zigzagguzzi View Post
Transmissions are different today. The overall ratios for the six speed plus transmissions are probably the same as for the old four speeds. So a 355 may have the same overall towing ability as a 411. What do all the rest if you say. Peace,jim
The 6R transmission used in the F150 does in fact have a very broad range. This isn't a Ford thing, this is common to other modern transmissions. Low is a 4.17 reduction, reverse is a 3.4 reduction, and there are two overdrives, on 5th and 6th.

Compare that to the GM 4L80 used in the Silverado 2500 referenced below. Low is a 2.48 reduction, reverse is a 2.07, and there is a single overdrive. There is an advantage IMO in that 3rd is direct.

What that means in terms of overall gearing (transmission plus final drive) is that the 2500 would need approximately a 6:1 rear axle ratio to match the first and reverse overall gearing ratio of the F150 with a 3.55. And the GM would need a 3.3:1 rear axle ratio to match the overall gearing of the F150 with its .69 overdrive. The wide range of the transmission provides sufficient torque at the wheels in the lower gears, and a better overdrive.

This leaves out an analysis of matching transmission gears to axle ratio given a preferred cruising speed.

This does point out a challenge to conventional wisdom about what rear axle ratio is appropriate for towing. Some manufacturer (don't know which one) has an advertisement saying "the rules have changed". Seems apropos.

Jeff
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Old 04-21-2015, 07:01 PM   #6
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Some times "dealers" are not up on things as I specked 1979 3500 crew cab chev. with everything heavy duty coolers etc. with 454 big block eng. 3.73 rear for towing 30 ft AS. When deliv.to dealer had 4.11 rear I asked why as I specked 3.73. Dealer stated he did not think I knew what I was doing, changed ratio on his own. This pu was specked with some very exp. special items. He reduced price way below his cost or I would not take delivery, also he stated could not sell with out huge loss. I should not have taken as max. gas mileage 8 mpg with or with out load. This dealer lost my familys future sales over this. His final remark was he made huge mistake second guessing what customer wanted. This one reason I do not like rears over 3.73 that I have always had plus big hp engs. jcl has lots of info in his post.
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Old 04-22-2015, 12:53 PM   #7
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Our 03 Dakota has a 353 rear end and with the 4.7 V8 engine it does fine with our 25' Excella. Sure I'm in 2nd gear on a 6 or 7% grade but it does OK. As good as my '91 Jimmy with the 350 and a whole lot quieter ...exactly the same HP/torque by the way.
We met a rig in Northern Ontario (with all the 7% grades) pulling a SOB with his brand new Ford Eco-boost. He had exactly the same gas mileage as us and exactly the same 2nd gear experience. He was however planning to swap the TV for the new Ford Eco-boost coming out this year as it has more HP and Torque.

As for tow-vehicle size and weight, the primary importance is whether the TV has sufficient braking power to hold the trailer back if trailer brakes fail and is the whole rig stable under panic conditions (which is primarily the hitch set-up).
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Old 04-22-2015, 01:21 PM   #8
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Ram 1500, 3.23 rear end, 5.7 Hemi, 8 speed

I'm towing with a 2014 Ram 1500 4X4 with the 5.7 Hemi, 3.23 rear end and an 8 speed trans. Max tow capacity is 7750# The same truck with a 3.92 ratio has almost a 10,000# max tow capacity. I pull a 23FB Flying Cloud with no issues. I was a bit concerned about the 3.23 ratio, but it hasn't been an issue. Gives me GREAT mileage when not towing. I'm averaging around 14-15mpg when towing.

I found that if I want to go to the 3.92 ratio, it would cost me about $1400 - 1600 to make the conversion here in the Bay Area. The 8 speed trans seems more than able to handle the towing. I'd be comfortable pulling up to a 27' with my rig with it's current 3.23 gearing, as long as I didn't have it loaded all the way to it's GVWR.

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Old 04-22-2015, 10:59 PM   #9
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we run a 2013 F150 with the 3.5 Ecoboost and a 3:55 rear. We have about 35000 ks on it now and about one third of that is towing a 30 ftAS. I cruise between 60-65mph when towing and on our recent trip from Florida back to Ontario we averaged just over 13 mpg based on US gallons. I use cruise control exclusively unless traffic is very heavy. Even on the hills in Kentucky and Tennessee, the engine and transmission doesnt hunt. The lowest it has dropped gear wise is 3rd max RPM about 3500. On the flat, in 6th RPMs are about1600. I run in tow haul all the time, tranny and rad temps never change. As i have always done with all my vehicles, I change the oil every 5000 miles regardless of usage.
On a separate note, it is one of the most comfortable vehicles I have ever owned. I like the Sync system and the hands free options particularly the nav system with the traffic alerts. The technology in this thing is amazing and I understand the 2015s are even better in that dept.
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Old 04-23-2015, 07:38 AM   #10
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Jcl thanks for the info. Peacejim
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Old 04-24-2015, 08:56 AM   #11
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The torque characteristics of the Ecboost engine are more like those of a diesel; torque comes up very quickly as rpm builds, so it's not necessary to rev the engine to 4000+ rpm to get max torque as it is for most normally aspirated gasoline engines. Hence no need for super low gearing. The guys at the fast lane truck pulled a 10,000 lb. trailer up the 7% grade across the Continental Divide on I-70 at speeds up to 65 with 3 big guys in the cab with no effort. They could have gone faster. Engine speeds in the 2500-3500 rpm range if I recall correctly. The Ecoboost is the nearest thing to a diesel when it comes to towing, although not when it comes to fuel economy.
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Old 04-24-2015, 10:37 AM   #12
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I don't think I need 4000+ rpm to get max out of my 6.0l chev. w/3.73 rear gears, as I can pull anything I desire w/out this figure, the only time I see high rpm is when I take off like drag racer also I don't baby when I start from stop. As for diesel & mileage do math & figure cost of diesel eng. plus diff. in gas & diesel fuel prices & miles driven over period of time. But every body to there own liking of engines etc. I'm not impressed with new style computer controlled trans. as my escape does not perform as adv. w/out any fixes avail. from FORD.
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