E350 spring compression rates

I have a 2014 Phoenix Cruiser 2100. It sits lower in the back than it does in the front. I have installed Sumo springs which added about 1/2” lift to the rear.  The front seems high. I am thinking about changing the front springs from E350 springs to the E250 ones. Does anyone know the compression rate difference between the E350 and the E250 springs? Has anyone else had this issue and come up with a solution? Thanks, Doug.

Hi Doug,

I think I can provide some insight on addressing the condition you are dealing with as our 2007 model 2350 once had the same condition.

Our tail was lower than the front by a noticeable amount.  Our 2007 E350's front coil springs were originally over-rated for the actual load that our front suspension bears.  I had learned that our 2007 Super Duty E350 was built with the same front coil springs as an E450 chassis of the same model year which raised the front noticeably high.  The ride up front was also harsh, more than what we considered reasonable.

I simply went with the next rated spring "lower", an effort at being conservative with the modification.  It was a gamble that worked out very nicely.  You can read all about the project by CLICKING HERE.  Included are many pictures.

One thing is certain.... you are on the right track in your thinking.  Once completed (don't forget a wheel alignment), you and your rig will both appreciate the reduced thrashing.

I bought my 2910 used and the previous owner had more leafs added to the rear to correct the nose up issue.
Larry

What was done makes a lot of sense for model 2910 being so much heavier on both axles compared to short PC's.  Adding more leaf springs to model 2100 and 2350 would achieve a level rig, but I anticipate that the harshness of ride would increase significantly.  Our 2350 is already harsh in back, hence I addressed the problem by lowering and softening the front end.

Also, on a personal note, I needed assurance that our roof top a/c unit clears our garage door opening.  Raising the tail in any manner, might have introduced an interference.  As it turned out, lowering the front the way I did, raised the trailer hitch about 3/4" via "pivoting" on the rear axle, but the modification slightly improved a/c clearance due to it being "forward" of the rear axle.  In my case, there was a multifaceted benefit.