Did some poking around on the internet yesterday to try and compare the MOOG springs with the factory Ford springs and I thought I'd just share this here for future reference.
Looks like the MOOG springs provide lift simply due to their higher spring rate. The installed lengths and free lengths look very similar to the NAPA factory replacement spring specs I could find but the load rating is higher. I'll give these MOOGs a shot and see how they do.
MOOG CC880S
Super Duty Replacement coil spring
ID: 4.00"
Bar Diameter: 0.81"
Spring Rate: 652.00 Lbs Per Inch
Load: 3006.00 Lbs
Installation Height: 12.00"
Free Height: 16.60"
End Type 1: Pigtail
End Type 2: Pigtail
Spring Type: Variable Rate
These are the specs off the NAPA recommended factory replacement spring for my 2002 Ford E350SD with 7.3L engine:
ID: 3.98"
Bar Diameter: 0.78"
Spring Rate: 590.00 Lbs Per Inch
Load: 1893.00 Lbs
Installation Height: 13.00"
Free Height: 16.21"
End Type 1: Pigtail
End Type 2: Pigtail
Spring Type: Constant Rate
These seem to be the factory Ford spring codes and their associated load ratings:
Front Coil Spring Codes
PV = 3900 lb. (original 1995 4x2)
RV = 4050 lb.
UV = 4380 lb. (from 98 Quigley 4x4, I used these) F2UA-5310-UA
VV = 4600 lb.
Some info I found over on thedieselstop relating to the factory Ford spring codes:
Quote:
Look on the Federal Certification Label then look under "Spr". The label is on the lower doorpost behind the driver's door. It includes VIN, tires size and PSI, date of assembly, and lots of codes, including paint codes, axle code and spring code.
The spring code is probably a two-character code, such as VA or VB. The first character is the front springs and the second character is the rear springs.
For 7.3L pickups, rear spring codes were A, B, and C. Generally, A = F-250 (6,084 lbs. @ground), B = F-350 SRW (6,830 lbs. @ground) , and C = F-350 DRW (8,250 lbs. @ ground). However some F-250s have rear spring code B.
Front coil spring code on 4x2 diesels was probably L = 4,850 pounds @ground. A few 4x2s might have spring code K = 4,550 pounds @ground.
Front leaf spring codes on 4x4 diesels were U, V and X.
U = 4,800 pounds @ground
V = 5,200
X = 6,000
Some tiny few pickups had front leaf spring code W = 5,600 pounds @ground, but as a rule only F-450s came with front leaf spring code W.
The code X front springs were only on pickups with the snowplow pkg, were normal on diesel F-450 4x4s, and raised the front end up on pickups about 1.5" compared to the code V springs. However, lots of guys replaced their stock code U or V springs to get that slight lift and to firm up the front end
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