the later year Fords do now come with heavier suspension components which means steering stabilizer and shocks may be OK as-is. (See Fords website on E-350/450).
We own a 2007 E350, the last year before Ford's suspension improvements of current day. When the change was introduced, I studied the suspension and brake specs to better understand what I missed out on. I hope I have this accurate as it has been years since I reviewed the technical differences. Use this just to get the idea.
Today's E350/E450 suspension was introduced in 2008, easily identified by the restyling of the front grill to what I call the industrial dump truck look. 2008 was a transition year in that it got the latest suspension and grill, but has the earlier oval/roundy dash board design. 2009 is the first full year of change and as far as I know, is the same for 2013.
There were 3 main areas of change.
1) styling
2) suspension
3) brakes
1) styling
- The front grill allows for more air to flow through the engine compartment
- The dash board added a glove box and accomodates an optional navigation system.
- The general layout is improved addressing issues such as the 12v outlets placed away from the gear shift selector
- The two entry doors got 2-tier storage pockets
2) suspension
- The E350 gets a rear stabilizer bar (all E350s from 2007 on back never got one)
- Both E350 & E450 get a better mounted front stabilizer bar
- Front suspension improved through minor adjustments of the upper & lower control arms
- Both E350 & E450 chassis weight ratings were increased though I can't recall what exactly changed to make it happen
3) brakes
This one has been debatable as to whether they were improved or simply cost reduced
- Rotors got a bit bigger in diameter with bigger matching brake pads
- Caliper piston diameters are a bit bigger
- The rotors are separate parts, not part of the hub like before. Real heavy duty trucks with disk brakes have the hub and rotor as one cast part for best performance
- The E450 lost the industrial parking brake assembly just behind the transmission, I assume it now is like the E350 with the parking brake by the rear wheels.
My appologies in advance if I got some of this wrong, but I don't have time to refresh my memory to supply most accurate data.