No problem with the bed clearing the hanger, only issue I have is the axle bottoms out hitting the bump stop sometimes if driving on poorly paved roads. Other than that it rides nice.

 

The Posies were a big improvement on the front of my 51 F1 (with 302) but they replaced stock springs which were worn out and missing two leafs. I need to recheck to see if I need to change the shocks on the front.

 

I will give Posies a call. Thanks everyone.

 

Follow up.....
I finally replaced the front mono-leafs with Posies dual flex. These really do smooth out the bumps compared with the mono-leaf. I could immediately tell a difference going down the driveway. (not sure how it would compare to stock springs).
Some comments: The truck seems to sit about 1/2" higher than the mono-leafs.
They did supply 1/2" u-bolts instead of the 9/16". I would have used the 9/16" mono-leaf U bolts except they were too short. Their online installation article says to torque the bolts 108 to 125 ft-lbs, which is the same as the factory specs for the 9/16" bolt. Eaton's website says to use 65 ft-lbs for the 1/2". So I think I will follow up with Posies to see if 108 to 125 ft-lbs is correct for the 1/2". (I wonder if at one time they supplied 9/16" is why they list the factory specs?? )

On a different topic.....When I installed the mono-leafs 25 years ago, I found the pilot holes (for the spring center bolt) in the i-beam axle was about 1/8" or so wider apart than the leaf spring center to center distance. So with the rear eyes installed and the springs sitting in the axle pilot holes, the front eyes ended up about 1/4" wider at the front than the rear eyes (leafs are no longer parallel. I installed the drivers side front shackle and there was no way the right side mono-leaf would flex enough to install the remaining front shackle (it was 1/4" or so off). My fix was this....the front shackles have a built in offset in one of the shackle plates. I reversed the side this plate is supposed to be on. The right spring is still not parallel, but at least there was no binding. Its been this way 25 years now. (no noticeable wear in the pivot pins either)
Sifting thru the website here, it seems others installing new springs may have experience this too. I believe the stock springs may have had plenty of flex (or lots of bushing wear) and I never noticed this before. Perhaps Ford intended some "preload" and they drilled the pilot holes a little wider??.
At any rate, I saw the same thing again with the Posies. I pulled on the front of the spring and I believe the Posies spring would have flexed enough to get the shackle installed in the correct orientation. But my gut instinct says it should not bind so I installed the one shackle with the plate offset on the opposite side...just as before.
Anyone have solid information on why the pilot holes do not equal the distance between the springs? or my fix?

 

more follow up for those interested...
the front 1/2" u-bolts supplied get a torque of 65 ft-lbs, not 108-125 ft-lbs as Posies website shows. Posies said the misprint was from an older article.
Regarding the rear springs, I finally installed the rear Posies springs. They replaced the stock rear springs in which I had removed every other leaf. This set up had axle wrap but it was fairly smooth. The new rear posies don't ride quite as smooth as the set-up I had. The axle wrap however is now gone.
As with the front springs, I got in a hurry and failed to measure the before and after heights. I do believe the rear sits slightly higher than what I had, and definitely the front (previously monoleaf) sits a little higher. Wish I had measurement for comparison
But overall, I am happy with the results.

 

Can't say what Ford might have been thinking 75 years ago, or if they even were, but I'm fine with your fix. Certainly binding in your suspension is not a good thing.

 

I noticed the same issue with installing new stock style front spring packs last summer. The spring bolts were about a 1/4" off from the axle holes. I ended up loosening the front shackles and then used a long drift slid into a u-bolt hole in the axle to lever one of the spring packs over while a trolley jack held the spring up, then it popped right in. I did not like to do it that way, but that is how it worked out. I wish I would of thought of your idea on trying to reverse one of the shackle links.
Anyway it sure steers and handles well, the alignment shop said the alignment went well and the caster and camber is good. It does ride rougher with the new springs. I might try to do as Ford says in the maintenance section of the shop manual, to spray the springs with a dripless type of penetrating oil. I am thinking aerosol Kroil maybe.