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Message: [QUOTE="HeavyAssault, post: 1503807, member: 782"] Sorry I didn't mean to confuse OEM springs with aftermarket springs. Most aftermarket companies seem to focus on either gas or diesel motors over "weight rating" of the truck as F250 or F350. Some will not even tell you if they are for a gas motor or diesel motor as they are just building springs for height. I'd guess if you really wanted to tune the ride you could get OEM 4k springs and use spacers for height. Anyway sorry for the confusion and I wish the cut and paste below came out better. 2015 info I found thru Ford site: Suspensions (cont’d) SPRING SPECIFICATIONS — FRONT COIL Super Duty Series/Model Combined Rating @ Ground (lbs.) Height of Spring @ Design Load (in.)Inside Dia. (in.)Wire Dia. (in.)Deflection Rate @ Ground (lbs. per in. ea.) F-250/F-350 4x2 3800 12.54.3. 799 638 3950 12.54.3. 799 638 4100 12.54.3. 810 677 4250 12.54.3. 810 677 4400 12.54.3. 830 716 4550 12.54.3. 830 716 4700 12.54.3. 870 745 4850 12.54.3. 870 745 5000 12.54.3. 880 780 5250 12.54.3. 880 780 F-250/F-350 4x4 4000 14.74.1. 670 349 4400 14.74.1. 690 383 4800 14.74.1. 720 410 5200 14.74.1. 730 430 5600 14.74.1. 760 469 6000 14.74.1. 770 499 F-450 4x4 5200 14.74.1. 730 430 5600 14.74.1. 760 469 6000 14.74.1. 770 499 6500 14.74.1. 800 553 [/QUOTE]

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