The Skyjacker 6" coils are 19" long free length.
They have a 350# PPI spring rate, not as soft as the described Jeep coils but also the Explorer is heavier then the Ranger (not much, but a little)
Now Eibach also makes 5" lift coils for the TTB and I believe a 300# PPI rate is available.
That post has some good information and I REALLY like the coil retainers he built, compared to the normal J hooks.
I believe if I finally get around to re-doing my shock mounts I can beat his flex with my cut and turned beam setup.. I believe my current setup matches his flex numbers, and I am using the Skyjacker 6" coils
Also I noticed he is running 18" coils with Duff axle pivot brackets, I DO NOT believe his truck could be aligned with this setup, + camber......
I like the spring location he chose for the slip yoke.
As mentioned once you get into a long travel TTB setup like this the steering becomes the limiting factor. The Superlift Superrunner kit helps with that.
My next step will be to re-locate my shock mounts, When I measured my truck I was able to get 3.5" or stuff and 9" of droop. My brake lines, urethane bushing style radius arms, and steering were limiting the droop beyond that. SInce then I have installed the Superrunner steering. Next I will re-locate the brake line and modify my shock mount to take full advantage of my shock travel. Down the road I would LOVE to either convert my Skyjacker radius arms to Heim or get some custom arms made. Camburg and Duff both make heim radius arms for the TTB.
I have clearanced the oval in my pass beam for the axle shaft more then what he shows in the article, it still hits slightly (I can see on the shaft itself, not sure when it hit).
Also I do not have the same problem with the inner axle shaft poking through the slip yoke at fulls tuff, but I attribute this to having cut and turned beams with an increased track width built in, and a custom length outer passenger axle shaft.
I believe I can beat his flex numbers with my current setup, and once I finish the modification to my brake lines and shock mounts I will measure again.
Also keep in mind that with the setup shown in that article I don NOT believe his truck can be aligned, but it may be close due to how soft his coils are. a 4" coil with a 2" axle pivot drop (Duff brackets) is pushing the limits of the 2.75 degree camber shim. Those Jeep coils PROBABLY net 4.5-5" of lift over stock.
IN order to get the camber back into check he would need cut and turned beams or taller axle pivot drop brackets. He could also modify his beams by moving the lower ball joint mount outward (similar to Autofab and others).
I have seen a 93 Explorer Sport with the following setup max out a 20 degree RTI ramp:
James Duff old stlye extended radius arms
James Duff dual shock hoop
Superlift 5.5" coils
James Duff axle pivot drop brackets
Superlift TTB coil retainers (J hooks)
AND
custom cut and turned TTB beams, 3" cut and turn, 1" extended track width (duplicates of my beams)
