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Old 10-06-2018, 09:39 PM   #11
Almost There
 
Join Date: Jun 2015
Posts: 95
Year: 1999
Coachwork: American Cargo 14'L x 7'8"W x 7'H Box
Chassis: Ford E350 Cutaway
Engine: 7.3L Powerstroke
Rated Cap: 11500 lbs
Water tanks

Spent some time crawling around under the vehicle to plan the tank installation. It looks feasible to put 60-ish gallons of freshwater (insulated and electrically heated if necessary) in the center section between floor and chassis cross members. Since my fuel tank is in the center behind the rear axle, I can fit another 35 gal of water (or diesel) where a passenger van would have the fuel tank between drive shaft and driver side frame rail.

Outside of the frame rails will be storage boxes and a 30 gal grey water tank array on the passenger side and another 30 gal grey tank on the driver side under the shower. Behind it a 25 gal black tank under the toilet. There is also enough space left on the driver side for the drain hose, gloves, etc. Nothing would reduce the ground clearance of the vehicle or even extend below the front cab rockers.

Since I am going to replace the box floor, I can install the center tanks from above, which should be a whole lot easier. Everything outside of the frame rails is easy to get to from underneath.

Here is a crude mock-up of the underfloor storage with the 6" suspension lift:

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Old 10-11-2018, 07:41 AM   #12
Mini-Skoolie
 
Join Date: Oct 2015
Posts: 24
looks fantastic



Subscribing
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Old 10-11-2018, 09:52 AM   #13
Mini-Skoolie
 
Join Date: Apr 2018
Posts: 24
Following this build. Do you have any idea what rear gears are on this?
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Old 10-11-2018, 11:51 AM   #14
Almost There
 
Join Date: Jun 2015
Posts: 95
Year: 1999
Coachwork: American Cargo 14'L x 7'8"W x 7'H Box
Chassis: Ford E350 Cutaway
Engine: 7.3L Powerstroke
Rated Cap: 11500 lbs
Quote:
Originally Posted by E450Shorty View Post
Following this build. Do you have any idea what rear gears are on this?
Rear axle ratio is 4.10, which feels a tad short with the current 29.3" tires (225/75R16), even in the mountains. With 31.7" tires (235/85R16 BFG A/T KO2) the overall ratio should be right. Unfortunately, only mud tires are available in 33.3" (255/85R16 BFG KM2) and I think that A/T tires will be better on the Interstate and in the mountains/deserts out West. 255 width is the most I can get on the dual wheel rear axle without spacers. So most likely it will roll on 31.7" tires with .71 overdrive and 4.1 rear after everything is said and done.

For comparison, I am running 34.5" tires (315/75R16 BFG A/T KO2) on my 85 military Blazer with .696 overdrive (after installing a 700R4 transmission) and 4.10 rear which is a perfect combination off-road and on the highway. However, that would be too tall for the much heavier and less aerodynamic box truck even though the 7.3L engine has significantly more grunt than the 6.2L GM diesel. With 31.7" tires, the Ford 7.3L will turn 2160 rpm at 70 mph, about 200 rpm faster than the Blazer which sounds about right. The 33.3" tires would drop the rpm to 2056 @ 70 mph - also not unreasonable.
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Old 10-11-2018, 12:33 PM   #15
Mini-Skoolie
 
Join Date: Apr 2018
Posts: 24
Im curious to see how the tire size affects your mpgs. I am considering running larger diameter tires on my short bus to bump the mileage. But i have to get it on the road first...
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Old 10-11-2018, 12:51 PM   #16
Bus Nut
 
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Join Date: Dec 2015
Location: pa
Posts: 984
Year: 98
Coachwork: 1. Corbeil & 2. Thomas
Chassis: 1 ford e350 2 mercedes
Engine: 7.3 powerstroke & MBE906
Our 1998 e350 extended van with guigley 4*4 and 3.55 diff's gets on average 18 mpg with 255/85-r16.
Our 1998 e350 small bus with 245/75-r16 rwd and 4.10 diff gets at best 15 mpg.
The Quigley with the 3.55 can run the speedo of the scale and still feels that it can go faster. I retrofitted both clusters with OEM tacho clusters out of a f series diesel trucks.


Like your layout Alpine
Later

Later j
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Old 10-11-2018, 02:30 PM   #17
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Join Date: Jun 2015
Posts: 95
Year: 1999
Coachwork: American Cargo 14'L x 7'8"W x 7'H Box
Chassis: Ford E350 Cutaway
Engine: 7.3L Powerstroke
Rated Cap: 11500 lbs
Aerodynamic enhancements

Just got off the phone with Rockport. They sell this air dam used on their box trucks separately for $915 FOB Elkhard, IN or Ocilla, GA.



If it only adds 1 mile to the gallon, it would pay for itself in ~50k miles.

Additionally, the huge benefit this air dam adds is space and comfort of moving around in the vehicle. It is designed for the cab roof to be cut out and for installation of a full height door to the box. Or omit the door and add storage in the air dam.
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