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2008- 2010 General Questions General questions related to 2008-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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Old 08-10-2011, 09:39 AM   #1 (permalink)
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Question bed height on f350

why does ford put 4" blocks in the single axle f350? why not use the 2" like the f250? i assume the duallys have 2" blocks as well? anyone lower there f350 single?
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2008 f350 crew cab lariat 4x4 v10 single axle
previous: early 99(6/98) f250 xlt 4x4,psd,xle4,auto,sc,lwb.
99.5 air box, scorpion spray in bedliner, isspro ev pre-turbo pyro,trans,and boost,a-pillar mount. rancho rsx shocks,
superchips microtuner(2 program), magnaflow 3.5" dp 4" back exhaust, zoodad mod,
31' jayco 5'er
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Old 08-10-2011, 10:17 AM   #2 (permalink)
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I have a set of stock 1 7/8" blocks off my F-250 if you are interested.
They use a larger block to compensate the heavier payload rating. That is why they are so raked out.
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Old 08-10-2011, 01:17 PM   #3 (permalink)
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Interesting question! Just wondering why you would want to lower a F350, is it for hitch height or cosmetics?

Before I ordered my F350, I asked about the reason for the different size blocks and if I remember some of it correctly, the different models have a different measurement from the ground to the bottom of the frame and from the top of the axle to the bottom of the frame. One reason the blocks by design are there is to keep a minimum clearance between the tires and the body of the wheelhouse (fender well).
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- 2013 F350 CC 4X4 Lariat SRW, Black.
Ordered Dec 2012 - Built Jan 11th 2013 - Picked up Jan 31, 2013.
- 2013 Ford Edge
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-2008 F-350 CC 4X4 Lariat, SRW, 3.73.
Any color, as long as it's "Black".
Ordered 12/31 - Born 02/11 - Picked up 03/29.
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-1982 - My Sister married a GM Sales Manager (He Retired, "Hello" Ford Super Duty, enough said, LOL).
-2003 - ZRX1200 (Some say "Mid Life", LOL).
-2008 - Jayco 313RKS 5th Wheel.
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Old 08-11-2011, 12:32 PM   #4 (permalink)
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i have a 5th wheel trailer, the gvwr on a single f350 puts me in good shape, f250 is borderline, f350 dually is overkill and 2 more tires to worry about. if someone wants to get all the weights right for towing, gvwr,gcwr,and towing capacity come into play. i ran into this problem with my old 99 f250. gcwr was fine, tow rating was fine, gvwr was not fine. i was overweight. i know the newer f250's have a higher gvwr than my old 99, but the problem has been finding a used crewcab longbed v10 f250 or f350. i found this f350, and the deal was good so io bought it. i went thru this height issue when i bought my early 99 as it had the 4" blocks, several trips to the dealer and i ended up with 2" blocks at fords expense. my dad's 05 dually has 2" blocks, his payload is higher than mine. so the question still remains. why the 4" blocks on a f350 single?

brian
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2008 f350 crew cab lariat 4x4 v10 single axle
previous: early 99(6/98) f250 xlt 4x4,psd,xle4,auto,sc,lwb.
99.5 air box, scorpion spray in bedliner, isspro ev pre-turbo pyro,trans,and boost,a-pillar mount. rancho rsx shocks,
superchips microtuner(2 program), magnaflow 3.5" dp 4" back exhaust, zoodad mod,
31' jayco 5'er
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Old 08-11-2011, 01:40 PM   #5 (permalink)
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Quote:
Originally Posted by goldrush View Post
i have a 5th wheel trailer, the gvwr on a single f350 puts me in good shape, f250 is borderline, f350 dually is overkill and 2 more tires to worry about. if someone wants to get all the weights right for towing, gvwr,gcwr,and towing capacity come into play. i ran into this problem with my old 99 f250. gcwr was fine, tow rating was fine, gvwr was not fine. i was overweight. i know the newer f250's have a higher gvwr than my old 99, but the problem has been finding a used crewcab longbed v10 f250 or f350. i found this f350, and the deal was good so io bought it. i went thru this height issue when i bought my early 99 as it had the 4" blocks, several trips to the dealer and i ended up with 2" blocks at fords expense. my dad's 05 dually has 2" blocks, his payload is higher than mine. so the question still remains. why the 4" blocks on a f350 single?

brian
More space for the axel to move. Don't know on the 08, but on the 99-07 the springs for the F-250 and F-350 SRW had the same load-bearing capacity. But with an extra 500 pounds in the bed of the F-350 SRW, the springs flexed more. To compensate for the lower bed/frame height in relation to the axel with this increased flex, they put the blocks in to increase the distance between the frame and axel.

In an F-350 DRW, the springs are bigger, so there is less spring flex then on a F-350 SRW, despite an extra 1000 pounds in the bed. With less flex means they needed less clearance, so the 2 inch blocks were fine.
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Old 08-11-2011, 04:08 PM   #6 (permalink)
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Thanks for the information, most people add block for levelling and I was just curious!!. Not sure what year and model of Jayco you have, but the reason I ordered my F350, was that the F250 didnít have enough GVWR capacity. On a truck scale my pin weight averages 2500 pounds when I loaded to go camping. Most of pin weight is on the rear axle and my box goes down to where the Aux springs are just about touching.

Last night I was looking through my notes that I had before ordering my truck. I have Ford documents that they give out for standard option suspension measurements loaded and unloaded, usually used by companies that install service boxes or flat decks. On one of their side notes was recommended what I stated above. Also with the different front spring options also come into play.

So for example with my truck and trailer, I have the heaviest load carrying front springs I could order (I donít know if you do?). Iím guessing that if I put 2Ē blocks on truck and hitch up my trailer, my box would be 5Ē lower and my front would be pointing up even more. Even now with my trailer setup when Iím driving at night my headlights are pointing high, although Iím below my truckís GVWR the body of the truck will tilt because the pin weight should be mostly over the rear axle.

Sorry just me thinking out loud! Let us know how you made out.
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- 2013 F350 CC 4X4 Lariat SRW, Black.
Ordered Dec 2012 - Built Jan 11th 2013 - Picked up Jan 31, 2013.
- 2013 Ford Edge
Built Nov 26 2013 - Picked up Dec 06 2012
-2008 F-350 CC 4X4 Lariat, SRW, 3.73.
Any color, as long as it's "Black".
Ordered 12/31 - Born 02/11 - Picked up 03/29.
-1972 First Ford - 1956 Fairlane - Mint
Rolled it at 100+mph (Teenager, Duh, no one hurt)
Totaled Oct/73 (Over 35 Years ago and still remember that lesson).
-First New Ford - 79 Bronco - Ordered Mar/79
150K Miles - I disassembled 2000 and I sent it to three different scrap yards.
-1982 - My Sister married a GM Sales Manager (He Retired, "Hello" Ford Super Duty, enough said, LOL).
-2003 - ZRX1200 (Some say "Mid Life", LOL).
-2008 - Jayco 313RKS 5th Wheel.
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Old 08-12-2011, 12:24 AM   #7 (permalink)
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The bump stop travel distance is the same regardless of which block is installed, because the bump stop tongue is at the top of the block . Basically the block just makes the truck sit higher in the rear, it does nothing for available wheel travel. I wouldn't be surprised if part of Fords reasoning was to have some visual product differentiation. The F-350 has its own look. I have an '11 F-350 and am considering swapping in 2" (actually 1-7/8) blocks in place of the 4 inchers (actually 3-7/8). To do it right you'll need the blocks (duh), correct U-bolts, F-250 shocks and F-250 sway bar links (if so equipped). Makes it get a bit expensive!
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Last edited by PerryB; 08-12-2011 at 12:28 AM.
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Old 08-14-2011, 12:48 PM   #8 (permalink)
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Quote:
Originally Posted by PerryB View Post
The bump stop travel distance is the same regardless of which block is installed, because the bump stop tongue is at the top of the block . Basically the block just makes the truck sit higher in the rear, it does nothing for available wheel travel. I wouldn't be surprised if part of Fords reasoning was to have some visual product differentiation. The F-350 has its own look. I have an '11 F-350 and am considering swapping in 2" (actually 1-7/8) blocks in place of the 4 inchers (actually 3-7/8). To do it right you'll need the blocks (duh), correct U-bolts, F-250 shocks and F-250 sway bar links (if so equipped). Makes it get a bit expensive!
that was my take on it too. the axle would indeed be 2" closer to the truck, but the travel, i think, would remain the same do to the stops.
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2008 f350 crew cab lariat 4x4 v10 single axle
previous: early 99(6/98) f250 xlt 4x4,psd,xle4,auto,sc,lwb.
99.5 air box, scorpion spray in bedliner, isspro ev pre-turbo pyro,trans,and boost,a-pillar mount. rancho rsx shocks,
superchips microtuner(2 program), magnaflow 3.5" dp 4" back exhaust, zoodad mod,
31' jayco 5'er
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