These spring brackets are designed to mount onto 1977.5-1979 Ford F250 4wd trucks and allow you to install either 2008-16 or 2017+ Super Duty leaf springs. Pictures with measurements are included to verify fitment. Please measure your truck before ordering.
 
These work well with either OEM axles or 2005+ SD axles. Skyjacker FR173S is a 2017+ leaf option. It is fairly stout and has more load capacity than you likely need. It rides well for how stout it is.
 
Skyjacker FR84S is a 2008-16 leaf option. It is plenty capable and is a little softer than FR173S. It should have enough capacity for most applications other than significant towing and hauling (well beyond your frame's legal capacity).
 
Both 2008-16 and 2017 Super Duty leaf springs are a massive 65" eyelet to eyelet. The main difference between the two types is the 2008 style has a 20mm forward bolt while the 2017 style has a 7/8 (really a metric equivalent) forward bolt.
 
These brackets are often used to help lift the truck in conjunction with a Super Duty axle conversion. A 3" advertised lift rear leaf will get the rear end roughly level with the front, when you have oem used 2005+ SD coils up front. 
 
Every bracket uses at least one factory drilled frame hole and this makes install a lot easier. You do need to drill several 7/16" holes in your frame. The brackets work as a template for the drilling location- no guess work.
 
This listing includes all four brackets, enough to swap out both of your rear springs for super duty springs. 16 new 7/16" grade 8 bolts and all metal lock nuts are included.
 
Here is a page with additional pictures of these parts installed in a 1978 F250 4wd- scroll towards the bottom:

https://www.battlebornbrakes.com/f26a-gallery
 
 
Axle Perches:
All 1977.5-79 F250 4wd frames are 37.5" wide in the rear. These frames do not require any cutting or welding of perches. This is the case regardless of whether you have an original axle or a moder Super Duty axle. So do not buy perches. The 3/8" U bolt plates we sell are a good idea though. 
 
You will need to separately purchase these things:
-Rear leaf springs
-Leaf Spring plate- the 2017 super duty trucks have the U bolt pointed downward but you can mount U bolts in the traditional upward fashion with a basic 3/8" thick steel plate that I sell
-Leaf Spring Shackles for rear of leaf spring. Any Super Duty shackles seem to work ok regardless of the advertised year
-U Bolts- upgrade to 5/8"! (see Superlift 11604 for example, but the length depends on your lift blocks) no lift block = about a 9" U bolt. longer is ok too. 
-Pair of 5/8" x 5" bolts/lock nuts and 7/8" x 5" bolts/lock nuts for the 2017+ leaves
-7/16" Drill bit

More information on installing a Super Duty rear axle can be found here:

https://www.battlebornbrakes.com/rearaxle