thanks for the info!

now, since i have a 4800lb front gvw, which of the others, 5200, or 6000 is the x spring?

 

The X spring is a FRONT spring code only.
For F250/350 2WD front spring (Coil):
B 3200
C 3350
D 3500
E 3650
F 3800
G 3950
H 4100
I 4250
J 4400
K 4550
L 4700
For F250/350 4WD front springs(leaf):
R 3600
S 4000
T 4400
U 4800
V 5200

F450 Front spring (leaf):
W 5600
F550 and Snow Plow pkg Front Spring (leaf):
X 6000

 

And for you pansies out there, here are the ratings for the 4x2 front coils:

250/350

Rating@Ground Height inside Dia. Wire Dia. Deflection@ground(lbs/in)
3200 12.0 4.0 .768 313
3350 12.0 4.0 .768 313
3500 12.0 4.0 .783 334
3650 12.0 4.0 .783 334
3800 12.0 4.0 .795 355
3950 12.0 4.0 .795 355
4100 12.0 4.0 .807 375
4250 12.0 4.0 .807 375
4400 12.0 4.0 .819 396
4550 12.0 4.0 .819 396
4850 12.0 4.0 .831 412