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2003 Ford F350 Rear Off Road Shocks - A Better Compromise

Reclaiming Our Super Duty's Cargo Bay
2003 Ford F350 Upgrading
2003 Ford F350 Pathetic
How pathetic is this? As... 
   
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2003 Ford F350 Pathetic
How pathetic is this? As built, our F-350 could carry a single mountain bike, a couple of gear bags, and perhaps a small beverage cooler: a load more fit for a Honda Civic than a Super Duty. Before we get pelted by the peanut gallery, we'll state that we're well aware that Greg Foutz has raced a Super Duty in the Stock Full class for several seasons now, and that Donahoe Racing built and raced a Super Duty in the 2005 Baja 1000. Just the same, with a crew cab and a burly Dana 60 solid front axle, our SD's platform is best suited to general off-road work and cargo hauling.
2003 Ford F350 17 Inch Shock Shafts
A look at the 17-inch shock... 
   
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2003 Ford F350 17 Inch Shock Shafts
A look at the 17-inch shock shafts revealed that the shocks were using less than half of their travel.
2003 Ford F350 Remove Bed
While we were very impressed... 
   
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2003 Ford F350 Remove Bed
While we were very impressed with the workmanship of the bed cage, it still had to go. A few hours, a Sawzall, and a grinder brought us to this point. Where a mountain bike barely fit before, we've now got enough space for a Yamaha Rhino.
2003 Ford F350 Stock Shock Mount
Here's the stock shock mount.... 
   
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2003 Ford F350 Stock Shock Mount
Here's the stock shock mount. Simple, durable, and ready to snag itself on all sorts of trail obstacles.
2003 Ford F350 Locations On Axle
We took some measurements... 
   
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2003 Ford F350 Locations On Axle
We took some measurements to begin the design process. We selected locations on the axle and on the underside of the bed, and measured from these marks. The upper shock mounts wouldn't be attached to the bed, but we wanted to tuck the upper mounts as high as possible. We also wanted to keep the shocks at a reasonable angle. Sure, it's possible to mount long shocks at severe angles, but severe angles make the shocks' valving ineffectual. We began by measuring our reference points at ride height.
2003 Ford F350 Echo Metalworks Forklift
With the help of the Echo... 
   
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2003 Ford F350 Echo Metalworks Forklift
With the help of the Echo Metalworks forklift, we measured our reference points while the axle was articulated, and while the axle was fully drooped.
2003 Ford F350 Bilstein 7100 Series Shocks
Bilstein's 7100-series shocks... 
   
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2003 Ford F350 Bilstein 7100 Series Shocks
Bilstein's 7100-series shocks feature a self-adjusting deflective disc valving system, independent rebound and compression tuning, spherical bearing rod ends, and a 2-inch-diameter shock body. Although this pair is custom-valved for Super Dutys, 7100s are also customer-revalvable and customer-rebuildable. The Super Duty 7100s boast a 14-inch stroke in minimal mounting space thanks to a short shock body.
2003 Ford F350 Mckenzies Performance Products
To help the brainstorming... 
   
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2003 Ford F350 Mckenzies Performance Products
To help the brainstorming process, we paid a visit to McKenzie's Performance Products and came away with a variety of tabs, bushing kits, and washers. Premade items such as these speed up the fabrication process and help to produce a cleaner final product.
2003 Ford F350 Unbolted The Bed
We needed room to work, so... 
   
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2003 Ford F350 Unbolted The Bed
We needed room to work, so we unbolted the bed and spaced it away from the frame. Yes, we set the bed atop (gasp) cinder blocks, which we'll have to qualify by stating: do as we say and not as we do. Wooden blocks would've been better, and removing the bed and setting it aside would've been the best, but we didn't have the storage room.
2003 Ford F350 Mocked The Shock
We mocked the shock into the... 
   
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2003 Ford F350 Mocked The Shock
We mocked the shock into the approximate upper mounting position. We wanted to tuck the upper mounts as high as possible but keep them under the bed. With better access to the framerails, we could reach the vestiges of the old bed cage (arrow). Our final mounting position was outboard from our original reference points. We mounted the shocks along the OEM path but raised both the upper and lower mounts for better ground clearance.
2003 Ford F350 Smooth Offending Metal
We used a flap disc in our... 
   
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2003 Ford F350 Smooth Offending Metal
We used a flap disc in our grinder to smooth the offending metal away from the top of the framerail. Two factory frame rivets were ground down in the process: we drilled them out and replaced them with Grade-8 bolts.
2003 Ford F350 Spliced Crossbar
After business hours and lacking... 
   
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2003 Ford F350 Spliced Crossbar
After business hours and lacking a single tube of sufficient length, we spliced our crossbar together from 1.5-inch, 0.120-wall tubing, which fit perfectly inside 1.75-inch, 0.120-wall tubing. We added strength and maximized the weld area by fishmouthing the ends of the fatter tube and by drilling holes for plug welds. These tubes are staying put. To stabilize the tubes on the table during welding, we used a pair of machinist's 1-2-3 blocks. Even if you have no intention of ever machining anything, these blocks are handy items to have around the workshop.

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2003 Ford F350 Lower Shock Mount 2003 Ford F350 Finish Welded 2
2003 Ford F350 Finish Welded 2003 Ford F350 Crossbar Mounts

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