Coil spring rates 83-97

AgPete139 said:

I looked up several coils for Ranger TTB's, and gathered the information below.


Skyjacker 4" coils = 450 PPI
Skyjacker 6" coils = 410 PPI
Skyjacker 8" coils = 410 PPI
Skyjacker Cherokee 6" coils (pt# JC60F) = 240 PPI (solid axle)

Jeep XJ coils = 180-220 PPI

Early Bronco 5.5" Deaver coils - 340-360 PPI (solid axle)

Deaver 4" Superflex coils = 350 PPI (solid axle)
Deaver 6" Superflex coils = 300 PPI (solid axle)

Rough Country 4" coils = 434 PPI

Trailmaster 4" coils = 445 PPI

Superlift 4" coils = 530 PPI

Jeep Rancho 6423 coils = 240 PPI (solid axle)

Rusty's Offroad coils = 150 PPI

James Duff 3" Progressive-rate coils = estimated 400-500 PPI (conflicting, dual rate #)



I noted above which are normally used in SAS / solid axle applications; however, you may use them freely in the Ranger/Explorer/Bronco II buckets. A spring rate is still a spring rate, after all.

A good compromise between flexability & stiffness will vary depending on your setup (engine size, winch, tube bumpers, forced induction, type of axle & locating setup, etc.).

You will want something that suits your application, and softer is not always better. Typically, down travel is preferred. Again, it it depends if you street, mud, rock climb, or desert jump your vehicle.

Remmy, I just preferred the Skyjacker coils over the other ones I had. I have no experience with JD coils on my particular rig. I was not worried about sag or ride height as much; mostly street comfort, trail riding, and capability with rocks. The Trailmaster's were harsh, even with my ProComp ES-9000 shocks. The softer 6" SJ coils were nicer with my 4.0L motor. People who have switched have had similar experiences.

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alwaysFlOoReD said:

I lost the file and can't find it on the net anymore, but a fairly big worldwide manufacturer, I think Moog, had a pdf of coil spring applications including free length and ppi, etc.

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