Gas or diesel makes no difference, front springs are determined by the payload package. Here is a list of front springs, their capacities and the part numbers. Part numbers can be determined by a tag on the spring itself.
F-Super Duty Monobeam Coil Spring Rates (F250/350 4x4)
Front GAWR Rating Current Vehicle Spring Coil P/N 5C34-5310-xxx
2014 F-350 SuperCab 4X4/383/4.30 1994 F-250HD SuperCab 4X4/460/5-spd/4.10 TX Flow 90 gal tanks, Rickard Bumper, etc.
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