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Old 02-04-2014, 05:06 PM   #21
Hansel
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Originally Posted by Ken / Claudia View Post
Hansel, When I wanted a heavy duty ford in 96 I read thru the sps. booket, and in 01 and 05,I have not checked since than. All parts brakes, axles, frames, engine, etc. were all same for 250, 350srw, 350 drw. They have different springs, tires and options such as axle ratios. I thought that the 350drw models had bigger everything comparing to a 250 but, not true at least when I read from the sales bookets back page were lists that kind of stuff. Springs, it's all about the springs and how many ford puts on them.
I'm going to do some research on the difference's, because now I'm curious

I don't think throwing more springs will automatically turn my truck into a 1 ton, but I will find out
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Old 02-04-2014, 05:10 PM   #22
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I was unaware that the placement of the pin varied enough to warrant discussion.

I assumed it was at the rear axle center line, or within 4" ahead.
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Old 02-04-2014, 05:16 PM   #23
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The pin weight would not significantly affect the front axle weight, but installing an 18" wide (1000 lb) fuel tank at the front margin of the bed would put the CB (not CG) of that tank about 30" forward of the rear axle. That would add a significant amount of the total weight to the front axle. A "guesstimate" would be about 25-33% of the 1000 lbs would be shifted to the front axle.
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Old 02-04-2014, 05:20 PM   #24
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Originally Posted by Hansel View Post
I'm going to do some research on the difference's, because now I'm curious

I don't think throwing more springs will automatically turn my truck into a 1 ton, but I will find out
Throwing on heavier springs "may" increase the capability of the truck to carry more weight, but the "licensed GVW" is still what is located on the sticker on the driver's door jam. Legally changing that sticker to reflect the increased capacity may be more expensive both in getting the approval and in future licensing/registration fees than it would be worth. If you live in a state with a mandatory vehicle safety inspection, there may also be a yearly "issue' getting it inspected.
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Old 02-04-2014, 05:27 PM   #25
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Throwing on heavier springs "may" increase the capability of the truck to carry more weight, but the "licensed GVW" is still what is located on the sticker on the driver's door jam. Legally changing that sticker to reflect the increased capacity may be more expensive both in getting the approval and in future licensing/registration fees than it would be worth. If you live in a state with a mandatory vehicle safety inspection, there may also be a yearly "issue' getting it inspected.
I'm not going to change my truck, but I am curious if that is really the only difference between a 3/4 and 1 ton truck.
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Old 02-04-2014, 05:47 PM   #26
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When we bought our 331 MKS I did the math over and over the result was it was too close with a 2500 so we went with a 2wd 1 ton and pleased we did as with all the extras we would have been way over the legal limit we now have room for extra fuel, fresh water and the dog
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Old 02-04-2014, 05:58 PM   #27
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Sad... not so much on a long bed crew cab but the shorter the A2A the closer to C/L that 4" makes things. It isn't how far in front of the rear axle, it's how far from center. Think seesaw
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Old 02-04-2014, 06:05 PM   #28
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I'm not going to change my truck, but I am curious if that is really the only difference between a 3/4 and 1 ton truck.
Can't speak for eariler models but 2011-2013 the only difference between my truck and the F350 SRW is the spring spacers. Mine are 2" and the F350's are 4" tall.
Part numbers have been compared and matched part for part.
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Old 02-04-2014, 06:33 PM   #29
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Have the specs changed that much from 06 to 14.
Here is the specs for the 14's
http://www.ford.com/trucks/superduty...ations/towing/
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Old 02-04-2014, 07:17 PM   #30
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Have the specs changed that much from 06 to 14.
Here is the specs for the 14's
http://www.ford.com/trucks/superduty...ations/towing/
Here are the specs and the build sheets for the 2006 Superduty lineup. There are some pretty significant changes in the '06 and the '14 model years.

https://www.fleet.ford.com/TRUCKBBAS...essd-ms_06.pdf
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Old 02-04-2014, 11:54 PM   #31
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Can't speak for eariler models but 2011-2013 the only difference between my truck and the F350 SRW is the spring spacers. Mine are 2" and the F350's are 4" tall.
Part numbers have been compared and matched part for part.
.

Before 2013 most 250/2500 were 350/3500 SRW with lighter springs. Both with Camper Packages had the 350/3500 spring packages, but lower GVWR for licensing purposes.
When I dropped our new 5er on our Ram 2500 with Camper package, figured I was good and at about GVWR, as it didn't even engage the overloads. Boy was i wrong! I have no reason to change, truck sits fine, tows fine, stops fine, handles great.
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Old 02-05-2014, 04:31 AM   #32
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If you go to the Ford Build Sheet, you will see that for the 2013 F250/F350 the rear spring packs are "rated" 6100/6730. This might be done with "mirrors and silk scarves" (magic) but I think it's more than a spring spacer to increase the spring rating that much.

Also, the rear axles are different between the F250, F350SRW and F350DRW' Here are the differences per the charts on page 83 of the build sheet:

Axle Shaft — Spline Minor Dia. (in.) 1.36 1.50 1.35 —
Spline Major Dia. (in.) 1.50 1.57 1.42 —
No. of Splines (Hub End) 35 37 35

As you can see, the axle shaft the spline diameter and the number of splines is larger on the F350 SRW. With dual rear wheels, the axle shafts and spline measurements return to "near" the F250 measurements. I don't believe the same "rear axle assembly" can be installed in both vehicles with these differences in axle shaft machining. I did not check the 2012 or previous model years, so they may have the same axle assemblies, but the 2013 F250 and F350SRW do not have the same rear axle or spring packs.
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Old 02-05-2014, 05:14 AM   #33
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If you go to the Ford Build Sheet, you will see that for the 2013 F250/F350 the rear spring packs are "rated" 6100/6730. This might be done with "mirrors and silk scarves" (magic) but I think it's more than a spring spacer to increase the spring rating that much.

Also, the rear axles are different between the F250, F350SRW and F350DRW' Here are the differences per the charts on page 83 of the build sheet:

Axle Shaft — Spline Minor Dia. (in.) 1.36 1.50 1.35 —
Spline Major Dia. (in.) 1.50 1.57 1.42 —
No. of Splines (Hub End) 35 37 35

As you can see, the axle shaft the spline diameter and the number of splines is larger on the F350 SRW. With dual rear wheels, the axle shafts and spline measurements return to "near" the F250 measurements. I don't believe the same "rear axle assembly" can be installed in both vehicles with these differences in axle shaft machining. I did not check the 2012 or previous model years, so they may have the same axle assemblies, but the 2013 F250 and F350SRW do not have the same rear axle or spring packs.
John the axle listing in the build sheet is a misprint that has been around for the past 3 years. If you go to the actual parts book and look up the numbers you will find that they are the same for both the 250 and the 350 SRW. Many of us on the Ford Truck forum have done so and even a Ford engineer answered the question with an affirmative. Brakes are the same, axle is the same, frame is the same, springs are the same.

The additional rear axle rating comes from the tires and wheels.. Mine are LT245/75R17E which have a load rating of 3195 so it'd be kind of difficult to get that 6730 from that...

The F350 has rear axle ratings from 6290 when equipped with the same tire I have. When equipped with 18"& 20" tires it jumps to 6730.
http://www.fordparts.com/Commerce/Ca...=Ford&mo=F-250 Super Duty#Search


5560

Rear Spring
Ford 250 Series Wide Frame (Pickup) With Single Rear Wheels Ford 350 Series ; 2WD, With Diesel Engines, Ford 350 Series, 158"/4013MM Wheelbase, 156"/3962MM Wheelbase, 172"/4369MM Wheelbase
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Old 02-05-2014, 06:54 AM   #34
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After reading some of your post, I thought there was a larger difference but there is not, I even started a couple of threads on some truck forums and the answer is the same, looks like the real difference is just springs on the SRW truck.

So if that is the really only difference, then why such a price difference

Not trying too open a can of worms, but if the trucks are almost identical other than springs and badges, why such a huge price difference. I guess that's how they stay in business
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Old 02-05-2014, 08:06 PM   #35
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So how do insure this f450? My agent says that we will have to have a commercial policy. This rv idea is turning into one expensive hobby. And I thought there were hoops to jump through to get a class 7 ffl. I hate to say the ATF was easier to deal with. Hahaha
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Old 02-05-2014, 08:25 PM   #36
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I would check a different insurance agent. There should be no requirement to buy a commercial insurance for private use of a private vehicle. Now, if you were using your F450 for commercial purposes or if it were licensed to a business, that would be different, but if you're putting private license plates on it and using it for private transportation, he's not reading something correctly.
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Old 02-06-2014, 06:43 PM   #37
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So how do insure this f450? My agent says that we will have to have a commercial policy. This rv idea is turning into one expensive hobby. And I thought there were hoops to jump through to get a class 7 ffl. I hate to say the ATF was easier to deal with. Hahaha
It should be a simple question from your agent, is it for private or business.

Answer, PRIVATE!!!!!

I think he's giving you the run around
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Old 02-06-2014, 07:46 PM   #38
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I was told or read the same thing many times by guys with 450s/ 550s when weighting them and looking at insurance policies they said comm. vehicle even if they were only pulling RVs and had passenger vehicle plates. I did ask a driver once but, he did not know. My guess which is only a guess is the GVWR. Only a agent may have the answer.
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Old 01-26-2015, 03:15 PM   #39
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We just purchases an 02 350 dually with a 7.3. Feeling much better now. Cat scale outcome was not what I expected.
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