There are 3 differences between the SRW 250/350...

1) F-250 vs F-350 badges

2) 2" rear spacer block in 250 vs 4" in the 350

3) *most important* GVWR for F350 SRW is 9900 in most states and the F250 8800 in most states.

 

From 99 to mid 2001 the srw trucks came with a Dana 50, Ford started using the Dana 60's on all F250/350's from mid 01 to present ,the front axle is identical on both trucks, including springs.

 

 

Springs in the Source Book are EXACTLY the same:

Front Leaf 250/350

 

3600lb 1.12"(thickness) 55.63"(length) 3.00"(width) 350(deflection)

4000lb 1.18"(thickness) 55.63"(length) 3.00"(width) 370(deflection)

4400lb 1.18"(thickness) 55.63"(length) 3.00"(width) 390(deflection)

4800lb 1.18"(thickness) 55.63"(length) 3.00"(width) 410(deflection)

5200lb 1.18"(thickness) 55.63"(length) 3.00"(width) 430(deflection)

6000lb 1.25"(thickness) 55.63"(length) 3.00"(width) 470(deflection)

 

Rear Leaf 250/350

 

6830lb 6(leaves) 3.86(thickness @ pad) 58.1"(length) 3.00"(width) 320/670/1209(deflection lbs/sq") 3603(rating@pad lbs/spring)

 

Rear leaf DRW

8250lb 6(leaves) 3.95(thickness @ pad) 58.1"(length) 3.00"(width) 350/730/0(deflection lbs/sq") 4187(rating@pad lbs/spring)