Rear suspension options

[CarterKraft]

Used these guys for stockish replacement springs, they usually offer upgraded springs with additional rated capacity.

F-250, F-350 Cab Chassis Leaf Springs

2006	2012	F450SD and F550SD; Rear. 1/2in center bolt with a 3/4in diameter head	43-1747	Std	3	25	30.75	10	5.5	4.44	5900
2006	2012	F450SD and F550SD; 1/2in center bolt with a 3/4in diameter head	43-1747HD	Hvy	3	25	30.75	10	5.13	5.31	8000
2008	2016	F250, F350SD, F450 2WD and 4WD Except with helper; Two stage	43-1681	Std	3	33.19	33.19	5	6	3	3000
2008	2016	F250, F350SD, F450 2WD and 4WD Except with helper; Two stage	43-1681HD	Hvy	3	33.19	33.19	6	5.75	3.31	4400
2008	2016	F250, F350SD, F450 2WD and 4WD Except with helper; Two stage	43-1717	Std	3	33.19	33.19	3	6	2.31	3700
2008	2016	F250, F350SD, F450 2WD and 4WD Except with helper; Two stage	43-1717HD	Hvy	3	33.19	33.19	6	5.75	3.81	6800
2008	2016	F250SD, F350SD 2WD and 4WD Single or dual rear wheels Chassis Cabs	43-1699	Std	3	25.5	30.25	11	4.63	4.13	4000
2008	2016	F250, F350SD 2WD and 4WD Single or dual rear wheels Chassis Cabs	43-1699HD	Hvy	3	25.5	30.25	10	5.38	4.5	5400

 

[MuntCuffin]

Ended up finding the 43-1717hd's on autozone, of all places, for 4hundo a spring. Then a 20% discount they are having right now took it to like $330 a spring. Couldn't pass em up. Freight was a bitch, but the FedEx guy already hates delivering here...