2016 F350 Sagging in Back - Page 2 - Diesel Forum - TheDieselStop.com
'11-16 General Questions General questions related to 2011-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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post #16 of 31 (permalink) Old 05-26-2016, 07:49 PM Thread Starter
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I have had airbags on previous trucks. No way will you get 4" of lift from airbags. Maybe 2" if you keep them inflated to the max.
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post #17 of 31 (permalink) Old 05-31-2016, 08:32 PM Thread Starter
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Checked with Air Lift. Their air spring will not lift the truck but if you take the load off, install their air bags, inflate them to 85 psi, and put the load back on, it will "support" the load. After checking with three different suspension shops in Denver and getting three different answers, I have resigned myself to having to do the upgrade myself - even though my ancient body will protest loudly. I am thinking about Hellwig LP-35 overload springs and Firestone airbags. Maybe the SRW spacer blocks if the Ford dealer can install them without voiding my warranty. I am disappointed that a 5,500 lb payload brings my F350 dually to it's knees.
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post #18 of 31 (permalink) Old 05-31-2016, 09:03 PM
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What is the payload rating of your 350? If it is supposed to handle your camper, have you talked to your dealer about the sag?
Apples and oranges, but my 450 sits 1" high when unloaded and handles 4200# pin weight with only 1.5" sag.
Something about the payload of your truck and Fords marketing seems off-kilter.

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post #19 of 31 (permalink) Old 06-01-2016, 12:01 PM
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F350 DRW trucks might be 13k GVWR right?? Curbweight is going to be close to 9-10k.

I suggest you head to a dealer lot with a measuring tape, look at the window stickers, compare packages, look at the door sticker weight ratings and see what measures up. You will see it's the rear block that's the real difference in your new truck compared to the old truck.

Page 91 should help some: https://www.fleet.ford.com/truckbbas...SB_Updates.pdf
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post #20 of 31 (permalink) Old 06-01-2016, 09:58 PM Thread Starter
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I looked at the F450 when I was shopping for my truck and was suprised to see that the payload capacity was actually less than the F350. The 450 had a much greater towing capacity, however. I don't recall the exact figures. I checked with the local dealer and they will install the SRW blocks without "voiding my warranty". So that is the first step. Talked to Hellwig tech guy and he suggested replacing Ford single leaf contact overload springs with their #9703 three leaf springs. That might be the second option. I plan to add Firestone airbags, too.

My wife's solution is to go out and spend $45,000 on a brand new camper that weighs 700 lbs. less. My solution should be about $43,000 less!
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post #21 of 31 (permalink) Old 06-01-2016, 10:22 PM Thread Starter
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Looked at page 73 on Heavy Assault's link and it shows that the F350 dually bumper height is about 2" lower than the F350 SRW as he stated in an earlier post. Where is the logic in that? Another one of Ford's "Better Ideas"? I am definitely switching to the SRW blocks.
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post #22 of 31 (permalink) Old 06-02-2016, 11:38 PM
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I looked at the F450 when I was shopping for my truck and was suprised to see that the payload capacity was actually less than the F350. The 450 had a much greater towing capacity, however. I don't recall the exact figures. I checked with the local dealer and they will install the SRW blocks without "voiding my warranty". So that is the first step. Talked to Hellwig tech guy and he suggested replacing Ford single leaf contact overload springs with their #9703 three leaf springs. That might be the second option. I plan to add Firestone airbags, too.

My wife's solution is to go out and spend $45,000 on a brand new camper that weighs 700 lbs. less. My solution should be about $43,000 less!
The next time you are at your Ford dealer look for the large table top sized touch screen where you can configure trucks. Configure the F450 - where the only options are CC, 4X4, dually, eight foot bed and diesel. Look at the payload in the summary.

Then configure an F350. Configure it the same way except you'll have a choice of gas or diesel. Choose the gas and you'll see about a 1200 pound better payload in the summary. Then reconfigure the F350 with a diesel. You'll see the payload is now within about 500 pounds - the diesel added 700 pounds. The diesel is a heavier engine and has a heavier exhaust system.

Thus, the true payload difference when configured the same is about 500 pounds. This weight difference comes from a heavier rear axle, a larger and heavier front axle, larger and heavier brakes, and hydroboost braking compared to the F350 vacuum boost braking.

Remember, the payload limit is a function of total vehicle weight (GVWR). The trailer weight limit (relating GCVW) is a function of the brakes.

So, yes, the F350 has a greater payload. But not as much as the table says because the payload table uses the gas engined F350 for its payload rating. When comparing diesel to diesel the difference is much less.
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post #23 of 31 (permalink) Old 06-04-2016, 06:32 AM
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Looked at page 73 on Heavy Assault's link and it shows that the F350 dually bumper height is about 2" lower than the F350 SRW as he stated in an earlier post. Where is the logic in that? Another one of Ford's "Better Ideas"? I am definitely switching to the SRW blocks.
DRW trucks have a higher rated rear spring set. I'd even guess it's a gooseneck/5'er trailer thing.

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post #24 of 31 (permalink) Old 06-04-2016, 08:34 AM Thread Starter
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I have an appointment at the dealer next week to install the SRW blocks. Dealer says it will not void the warranty. I ordered the Hellwig #9703 overload helper springs that work in conjunction with the factory contact overloads. Also ordered the Hellwig 1-5/16" rear sway bar. Hopefully with the blocks and the springs I will get to where I need to be.
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post #25 of 31 (permalink) Old 06-10-2016, 09:37 PM Thread Starter
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OK. So I took Heavy Assault's advice and had local Ford Dealer order SRW blocks for 2015 F350 thinking that they would be nearly 2" taller than DRW blocks. What showed up were blocks that were only 1/2" tall. Dealer double checked part numbers and the 1/2" blocks were the correct part number. While I had the truck in I also wanted to have the XM radio antenna relocated to the cowl since my overhead camper blocks the signal to the factory roof mounted antenna. On the advice of another poster elsewhere on this forum that claimed that he had the local Ford dealer install another factory antenna and mount it on the cowl, I attempted to have that done also. Dealer ordered antenna and called me to tell me that cable was 3' to short to relocate antenna to cowl. Bottom line is truck was in the shop for three days and I am back to square one on both issues. I was hoping that I could get reliable advice on this forum.
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post #26 of 31 (permalink) Old 06-11-2016, 02:42 AM
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I don't know what you have installed or what was ordered but mistakes can happen.

f350 stock rear block height - Ford Truck Enthusiasts Forums

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Last edited by HeavyAssault; 06-11-2016 at 02:45 AM.
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post #27 of 31 (permalink) Old 06-11-2016, 11:31 AM
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I agree with HeavyAssault


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auto, 37/13.5/20 open country, Bushwaker cut-out flare, Bilstein 5100, Maxtow gauges (EGT, Trans temp, Boost), 4 inch diamond eye turbo back axel drop with BTM muffler, S&B intake, RR AIH plug, billet FPR with gold spring, CNCfab Sgt 1 HPOP, CNCfab HPOP line with cross over, CNCfab 4 line fuel kit, ARP heads stud, RDP plenum reinforcing insert, complete CAC intercooler boot kit, full engine seal and gasket kit, 360* turbo rebuilt, WWII, EGPV delete, dark blue CPS, Hydra chip with SDK tunes, Polished compressor manifold, HD coolant, 203* thermostat, Transgo HD kit, Energy suspension bushing kit, front and rear diff fully rebuilt with 4:88 gear ratio, Z36 powerstop heavy hauling brake kit, headlight relay mod, Fumoto drain valve AND STICKER

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post #28 of 31 (permalink) Old 06-11-2016, 11:55 AM
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X2, to be blunt, your slide in camper is way too heavy for that truck. A 450 would not be much better - still over gross. Add a boat - you were sold a bill of goods by the camper or truck salesman.

What to do.

Forget the blocks alone idea. That simply allows the springs to be grossly over bent before you hit the yellow rubber bumper stops between the axle and frame.

A long overload spring added would reduce sag somewhat, but I doubt it can help you as much as you need. You need some free spring going down the road loaded like you are or things will wear out or break much quicker.

A reworked spring pack is the best option if you plan on keeping the camper on the truck most of the time. It can be engineered to give you a decent ride when empty, and using your actual loaded weight be engineered with little trouble to keep sag to a minimum. So no need for the taller blocks. Is that minimal sag ok with the extended hitch for your boat? Maybe, maybe not.

If you go with the blocks together with a reworked spring pack, you need to decide this up front because it shoukd result in a slightly different spring collection, allowing a bit more sag in the springs, but not the truck bumper. This keeps the geometry of the ride correct so it does not overload the front axle, which is probably the weakest link.

You ought to run ypu truck with camper out to a truck stop with a set of CAT Scales. Be sure the folks doing the spring setup know those numbers. Your heavy load may be taking enough weight off the front springs that they have more options, but if you have a heavy overhead bed with cabinets that front axle may already be too close to its limit.

Good luck.
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post #29 of 31 (permalink) Old 06-14-2016, 09:15 PM Thread Starter
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I guess you are saying that camper manufacturers are selling us campers that cannot be installed on the truck manufacturer's biggest trucks? That is what I am starting to realize. I bought the F350 dually thinking that it would haul the Lance 1181. That is what Lance recommended. Your advice makes sense. I did install the Hellwig #9703 overload springs and it definitely helped. Easy install that took about an hour without jacking up the truck or removing the wheels. Probably going to add the Firestone airbags next.

I will go back to my original comment that my 2005 SRW F350 hauled a similar size/weight camper and I never had an issue with dragging my hitch when leaving my driveway. What did Ford do to ruin their trucks in the last 10 years?
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post #30 of 31 (permalink) Old 06-20-2016, 06:19 PM Thread Starter
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I did look at the F450 but payload capacity was actually less than F350. Towing capacity for 450 was much better. I sold my camper and am buying one that is 1,000 lbs. lighter. We will see what happens next...
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