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Old 02-19-2013, 02:37 PM   #21
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Nice truck trippster.
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Old 02-19-2013, 02:57 PM   #22
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Originally Posted by mjones12 View Post
Good explanation. But I haven't seen a lot on this thread about the gear ratios affecting the truck's published towing capacity. My Silverado 1500 towing capacity is only about 6,700 pounds with the axle I have, while a different ratio - with the same engine, transmission and tow package - would increase that to over 9,000 pounds. Nothing different but the gear ratio. Does the same thing happen with the Ecoboost?
The 2011 5.0 is exactly the same thing, 3.55 to 3.73 = 1600 lbs more towing but the payload would be the same.
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Old 02-19-2013, 03:18 PM   #23
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Just to be clear on axle ratios for those that may not understand.

A 4.10 ratio is a much lower ratio than a 3.31......even though it is a higher number.

1 turn of a drive shaft going into a 4.10 differential will make the wheels turn 4.10 revolutions. Great for towing, but the engine needs to spin faster at any given speed and transmission gear. When the engine spins faster, then normally the fuel mileage is worse......with exceptions. If the engine is under heavy load, the increased engine speed may actually help fuel mileage, since it might be a better power band area. But on level road, the increased engine speed is gonna burn more fuel.

1 turn of a drive shaft going into a 3.31 differential is gonna make the tires go around 3.31 revolutions. With that ratio, it will be harder for the vehicle to take off.....with our without a trailer......but definitely with a trailer. Also with those stiffer gears (lower number, higher ratio), there will be wider "spacing" between the transmission gears, again leading to a little engine HP and torgue loss to the wheels.
With a 4.1 rear ratio, it's the driveshaft that's rotating 4.1 times to one revolution of the axles/wheels not the other way around. The crown gear (for the axles) will have 4.1 times more teeth than the pinion gear (driveshaft).

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Old 02-19-2013, 03:27 PM   #24
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Originally Posted by Dave_Monica View Post
With a 4.1 rear ratio, it's the driveshaft that's rotating 4.1 times to one revolution of the axles/wheels not the other way around. The crown gear (for the axles) will have 4.1 times more teeth than the pinion gear (driveshaft).

Dave

Dave, big time mistake !!! Thanks for setting me straight....I will correct that immediately !!!
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Old 02-19-2013, 03:37 PM   #25
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Whew.....sometimes it is great to have moderator privileges. I corrected my big boo-boo, and also corrected my quote in post #17. Again, Dave, thanks for the head-up.
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Old 02-19-2013, 03:43 PM   #26
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Originally Posted by Trippster View Post

I agree. Unfortunately, I didn't know the max tow existed when I paid $4x,xxx for my truck.....woulda shoulda coulda.

So, I'm having to upgrade my 3.55 gears ($1,700 for 4X4) I am absolutely maxed out on my payload with wife, kid & carseat, dog & crate, and I had to purchase those goofy tow mirrors that slip over the factory mirrors. I also purchased a Bullydog GT tuner to maximize the towing capability. All in all, well over $2,000 extra and when my trailer is attached, I don't have enough payload remaining to carry anything extra in the vehicle.

Live and learn.....haha Will be awesome when regear is complete.....a real keeper!!!
Great looking truck! Assuming stock 30'' tires(not sure on the F150) you would be currently at a 3.04 axle ratio and will be at 3.51 after the gear swap.
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Old 02-19-2013, 04:42 PM   #27
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3.73s are really a must for any substantial towing; 3.55s will work but you might have to run in 5th rather than 6th; wouldn't go any lower numerically.

The Max Tow gets you:
* Another 500 pounds of GVW netting about 350 pounds of extra payload
* Bigger towing mirrors
* A slightly higher capacity rear axle
* A heavier duty radiator (even though the others say HD radiator)
* Heavier suspension bushings in the front end
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Old 02-19-2013, 07:12 PM   #28
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Just got back from our holiday camp trip, saw a lot of Ford Ecoboost in the campground, mostly towing lightweight TT...seems like the setup folks are going with now
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Old 02-19-2013, 11:57 PM   #29
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Have an 11 EcoScab 4X4 3.73 gearing with Max Tow (11,300lbs ) and HD Payload (1982lbs) in an XLT model. In Canada we don't necessarily get the big towing mirrors (I didn't) so I use the CIPA slide on extensions. It comes with a HD transmission cooler, integrated sway control, brake controller & Class IV hitch

This truck is a beast for towing and I wouldn't be buying a truck with 3.55 gearing for towing. The extra capacity in towing & payload is worth the cash. If the dealer can't find you the truck you want/need, keep looking until you find one that will/can
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Old 02-20-2013, 04:43 AM   #30
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I have a 2012 F-150 Screw with Eco and 3.55 gears, I tow a 25RR with it and it handles it just fine but that is about it's limit, I tow the camper in 5th to keep the engine at it's torque peak, about 2100-2200 rpm,These Eco's make their 420 lbs. max torque at that rpm so that should be your target rpm for those who are re-gearing for larger tires,
I also looked at max tow but I only pull the camper a couple times a year and wanted to retain the nicer ride qualitys and fuel economy of the normal 150.
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