Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Trailer Towing and Tow Vehicles Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 11-28-2012, 12:59 PM   #1
Senior Member
 
Workshop's Avatar
 
Join Date: Sep 2007
Posts: 1,334
2013 F350 4x2 with w/3.31 gear

Presently have a 2011 F350 CC DRW...we just downsized the 5th wheel and looking at a new F350 CC short box. If we go with the 4x4 the 3.55 axle is available...in the 4x2, only the 3.31 is. Does anyone have experience with the 3.31 towing. We downsized to a 29 ft Alpenlite with a pin of 2800# and a 'wet weight' of 12,600#.

The truck is a daily driver which I've gotten used to but is tight is alot of situations....but also the primary driver for a 85 year old MOM and a sister who has medical needs.....so entry height and bed height is important. For some reason the SRW's are higher than my present 4x4 DRW, if I go with another 4x4, but the height is lower in a 4x2....but only one gear available.

They don't give many options...

Thanks
__________________

__________________
2000 Alpenlite, 29 ft Valhalla - 2014 F350
Workshop is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 11-28-2012, 02:50 PM   #2
Senior Member
 
Join Date: Apr 2012
Posts: 368
Ford uses the 4.30 gearing for the F-450 which is what gives it the higher tow rating over the F-350. A Chevy truck with the 4.10 rear end has a 25% higher tow rating than the identical truck with a 3.73 rear end.

According to the published specs the Ford 2012 Super Duty gas powered trucks are only available with either the 3.73 or 4.30 rear end and for your planned load the 4.30 would be smarter. Ford also states a maximum 5th wheel load of 12,400 with the gas engine and that is with DRW. I would hate to have a DRW truck as my daily driving vehicle.

You can get the 3.55 with the diesel engine which with its additional torque can handle the taller gears. Even with diesel I would opt for the 3.73 rear end to tow a 12,600 lb. trailer.
__________________

__________________
elkhornsun is offline   Reply With Quote
Old 11-28-2012, 02:53 PM   #3
Junior Member
 
btritschler1's Avatar
 
Ford Super Duty Owner
Join Date: May 2010
Location: Tampa Bay Area
Posts: 12
I have a 2011, 6.7 diesel, 350, CC, SB, 4x4 with the 3.51 rear. I had no problem towing a 30' 5th Denali in the mountains of UT, MT, WY this summer. Trailer GVW was around 11,000 lbs.
__________________
btritschler1 is offline   Reply With Quote
Old 11-28-2012, 03:21 PM   #4
Senior Member
 
Workshop's Avatar
 
Join Date: Sep 2007
Posts: 1,334
To clarify...I am only looking at the 6.7 diesel. If I understand the information provided by Ford: the 3.73 gear is only available with the F350 DRW, the 3.55 with the F250/350 SRW in the 4x4...the 3.31 in the 4x2 regardless if a F250/350. That's the problem. If I want a F350 4x2 SRW, I only have the option of the 3.31.

Just left a local dealer that had a 2013 F350 4x4 CC SRW short box that had 95% of what I would order and it has a bed-load height 3 inches higher than the present F350 4x4 CC DRW truck I'm presently driving. The F250 4x4 is just over an inch higher.

I would perfer to order a F350 4x2 with a 3.55....but you can't.
__________________
2000 Alpenlite, 29 ft Valhalla - 2014 F350
Workshop is offline   Reply With Quote
Old 11-29-2012, 06:50 AM   #5
Junior Member
 
btritschler1's Avatar
 
Ford Super Duty Owner
Join Date: May 2010
Location: Tampa Bay Area
Posts: 12
Sorry, in my earlier response I had the wrong gearing. My truck has the 3.31 rear and I had no problem towing.
__________________
btritschler1 is offline   Reply With Quote
Old 11-29-2012, 08:46 AM   #6
Senior Member
 
Workshop's Avatar
 
Join Date: Sep 2007
Posts: 1,334
Quote:
Originally Posted by btritschler1 View Post
Sorry, in my earlier response I had the wrong gearing. My truck has the 3.31 rear and I had no problem towing.
Thanks for taking the time to check and update your post.

Spent the night reading various Forums after Googling F350 3.31 towing. Alot of information out there, so good, some not but informative. It would appear the standard 3.31 ratio that is available on the F250/350 is Fords standard ratio now. In the 4x2 that is the only choice as well as the 18" wheels. In the 4x4 you have the option of 18" or 20" wheels but when 20" wheels are selected then that changes the ratio to 3.55 automatically. I was able to build a F250 4x4 with 18" wheels and the computer/program on Ford allowed the 3.55.

From information that I read on several sites, the end result of a 18" with the 3.31 is basically the same as the 20" with the 3.55....so in the end it doesn't much matter. If I understood it correctly, you end up at the same result.

One would think that dealing with the 'old gear' thinkin' isn't the same with the new trucks/transmissions.
__________________
2000 Alpenlite, 29 ft Valhalla - 2014 F350
Workshop is offline   Reply With Quote
Old 11-29-2012, 01:06 PM   #7
Senior Member
 
JohnBoyToo's Avatar


 
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 4,828
One of the real benefits of the new 6.7's tranny is the ability to lock out the higher gears effectively lowering your gear ratio if that is of concern to you...

FYI, towing my heavy 5er, normally stay in drive and don't bother with doing anything special with locking out gears, etc.... I let the tranny figure it out for itself...
and I've not had ANY Issues going thru the 'hills' of Ark, Miss, Tenn with my 20's and 3.55 gears...
good luck.... granted only 30K miles on my 2012, 10k or so towing, it's been perfect...

oh, I'm a great big story teller - (the kids call me that when I tease them )
Given that this nice 6 speed tranny is an automatic that can be manually shifted, I do do something special when towing...
I will get up to speed and lock it IN 6th gear for all but the biggest grades and just let the engine and turbo pull most hills so it doesn't go thru the drama of downshifting and upshifting....
__________________
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk, 11 MVP Destiny, Open Range TT, popups, vans, tents...
JohnBoyToo is offline   Reply With Quote
Old 11-30-2012, 03:02 PM   #8
Senior Member
 
caissiel's Avatar
 
Join Date: Oct 2011
Posts: 1,312
All I know is that my programed 6.0L Ford with 17" tires has same torque at 2000 RPM as equally programed 6.7L and would not want to tow with larger tires. I am debating installing 18" wheels for 800lbs more rear axle capacity.
My power and fuel mileage at 60 MPH has been great.
And getting out of the sweet spot would be felt with my unit in tow.
__________________
Barbara and Laurent, Hartland Big Country 3500RL. 39 ft long and 15500 GVW.
2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Hypertech Max Energy for Fuel mileage of 21 MPusG empty, 12.6 MPusG pulling the BC. ScangaugeII for display..
caissiel is offline   Reply With Quote
Old 11-30-2012, 05:10 PM   #9
Senior Member
 
caissiel's Avatar
 
Join Date: Oct 2011
Posts: 1,312
Quote:
Originally Posted by caissiel View Post
All I know is that my programed 6.0L Ford with 17" tires has same torque at 2000 RPM as equally programed 6.7L and would not want to tow with larger tires. I am debating installing 18" wheels for 800lbs more rear axle capacity.
My power and fuel mileage at 60 MPH has been great.
And getting out of the sweet spot would be felt with my unit in tow.
And my gearing ratio is 3.73
__________________
Barbara and Laurent, Hartland Big Country 3500RL. 39 ft long and 15500 GVW.
2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Hypertech Max Energy for Fuel mileage of 21 MPusG empty, 12.6 MPusG pulling the BC. ScangaugeII for display..
caissiel is offline   Reply With Quote
Old 11-30-2012, 08:54 PM   #10
Senior Member
 
wingnut60's Avatar
 
Join Date: Aug 2004
Location: Wherever the Suites is
Posts: 2,982
I really don't think you can compare the 6.0 to the 6.7 with anything but negatives for the 6.0.
There is a bunch of torque/horsepower difference and 2 extra gears. The 6.7 should pull a 12000lb trailer with ease with any diff gearing.
Personally, I would not want 20" tires on a tow vehicle, but that is just me.
Joe
__________________
'15 38RSSA Mobile Suites
'05 36TK3 Mobile Suites--retired but not forgotten
'17 F450--trying one more Ford
'09 F450--died, replaced with '10--retired
wingnut60 is offline   Reply With Quote
Old 11-30-2012, 10:24 PM   #11
Senior Member
 
caissiel's Avatar
 
Join Date: Oct 2011
Posts: 1,312
Quote:
Originally Posted by wingnut60 View Post
I really don't think you can compare the 6.0 to the 6.7 with anything but negatives for the 6.0.
There is a bunch of torque/horsepower difference and 2 extra gears. The 6.7 should pull a 12000lb trailer with ease with any diff gearing.
Personally, I would not want 20" tires on a tow vehicle, but that is just me.
Joe
I use the Hypertech programmer and they have the power curves to prove it. The 6.7 becomes a beast at higher RPMs but they cannot improve much at lower towing RPMs.
__________________
Barbara and Laurent, Hartland Big Country 3500RL. 39 ft long and 15500 GVW.
2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Hypertech Max Energy for Fuel mileage of 21 MPusG empty, 12.6 MPusG pulling the BC. ScangaugeII for display..
caissiel is offline   Reply With Quote
Old 12-01-2012, 06:39 AM   #12
Senior Member
 
JohnBoyToo's Avatar


 
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 4,828
Morning Caissel !
having had an 02 7.3, an 03 and 05 6.0 in Excursions and not having issues with any of them - just wanted new
All had dyno proven custom tuned programming - not generic marketing -
now have a stock 6.7... there IS NO comparison...

my tuned 6.0 required turbo back exhaust, etc to get 400 hp...
my 6.7 has that stock.... but to each his own - enjoy !

I know which one I'd rather tow with... but I'll stop the Ford commercial now
__________________

__________________
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk, 11 MVP Destiny, Open Range TT, popups, vans, tents...
JohnBoyToo is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:05 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.