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F350 leaf springs

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CanCan
Reg. May 2004
Posted 2020-10-19 6:52 PM (#173320)
Subject: F350 leaf springs



New User


Posts: 1

Location: Dubach, LA
Hubby wants to change them out from 3 to 5 because we bought a heavier trailer. Trailer is a little under 20,000. We have upgraded hitch and put in new shocks. Do we need the new springs or is that overkill?
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ThreeCW
Reg. Apr 2014
Posted 2020-10-19 9:08 PM (#173321 - in reply to #173320)
Subject: RE: F350 leaf springs


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Posts: 124
100
Location: Calgary, Canada
Lots of questions to give you a reasonable answer:

Is this truck an F350 Dual Rear Wheel or Single Rear Wheel?

What it the GVWR of the truck?

Being on a horse trailer forum, I assume that this "heavier trailer" is a living quarter gooseneck horse trailer. Correct?

Is the "a little under 20,000" lbs the dry weight or the loaded weight?

Our truck is a 2011 F350 6.7L diesel, 4x4, 8 ft box with a 13,300 lb GVWR and our trailer a 2006 Hart 13 ft LQ, 3H that is 26 ft on the floor by 8 ft wide. The trailer is 17,000 lbs fully loaded. Our hitch weight (pin weight ) is about 4400 lbs with the trailer fully loaded. And our truck is at 100% of its GVWR rating with this load.

If you have a similar style of gooseneck trailer that weighs "a little under 20,000" lbs, then I believe that your truck would be considerably overloaded based on the truck GVWR. If it is a Single Rear Wheel it would be even more overload.

With a gooseneck trailer, a lot of the weight of the trailer is transferred directly to the truck bed through the gooseneck hitch ... in the case of our trailer, it is 4400 lb or 26% of the trailer weight. Like a chain is only as strong as it weakest link, the weakest link of hauling a gooseneck LQ is almost always the GVWR rating of the tow vehicle. The trailer towing capacity of the truck becomes meaningless when the truck GVWR (the weakest link) has been exceeded.

Adding more leaves to your springs will not increase the GVWR of your truck ... it will only give you heavier springs. The same way that air bags also do not change your trucks GVWR.
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HOUSE
Reg. Oct 2008
Posted 2020-10-25 8:49 AM (#173329 - in reply to #173320)
Subject: RE: F350 leaf springs


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Posts: 183
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Location: riverside ca

I would install timberin overload springs, they are similar to air bags but are solid so there is no adjusting, the advantage to these as opposed to adding more leafs, is that when you drive around empty  your ride is not changed, but when you put a load on you have much less suspension sag.  they are easy enough you can put them on in your driveway yourself and have no airlines or compressors.
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calamityj
Reg. Jun 2005
Posted 2020-10-30 8:30 AM (#173331 - in reply to #173321)
Subject: RE: F350 leaf springs


Elite Veteran


Posts: 690
500100252525
Location: missouri
 Under trucked for the 17K trailer... sadly, we learned the hard way after the airbags and other tweeks to an F-350 4x4 we bought new... but it depends if you stay in flat country... we are in the Ozarks and travel in hills all the time. First change to a real truck was a Sportchassis... now a KW western hauler... we are 31' on the floor. You gotta have braking power.... good luck whatever you do. My safety, and my horses safety come first.

Edited by calamityj 2020-10-30 8:31 AM
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gard
Reg. Aug 2007
Posted 2020-11-01 1:00 AM (#173334 - in reply to #173320)
Subject: RE: F350 leaf springs


Expert


Posts: 5870
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Location: western PA
I agree with " House" about the usage of "Timbren" overload "springs" As was stated, the are not overload springs. They are hard rubber cylinders that fit into the spaces of many axle bump stops. They can be set not to alter the original ride. We have ours arranged so that when a load of about 1800 lbs is on the truck, they start to touch and carry the additional weight.. This is also when the original overload springs begin to take up some of the additional weight.
As was also stated, they require no maintenance. There is no need for compressors, their plumbing or stopping to air up the bags,
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