I'm finishing up my lift kit with extended radius arms and the old ones got me thinking of a set up for the rear to utilize coil springs instead of leafs.
I have seen a ranger with a TTB rear end, but not a solid axle with radius arms and coils.

It's just an idea, extend my old stock radius arms, fabricate a cross member, weld on "perches" to axle to accept radius arms, remove spring perch and mount coil platform. Weld up a pan hard bar.

Hardest part is the coils, where to mount them to get the best flex. Under frame is too tight, outside leaves no room, inside frame...

I'm just thinking out loud, but I would like to try and tackle this.



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There's a crude render of my concept.

 

Reminds me of a 1964 Chevy 3/4 ton I owned long ago. Same Idea.
Don't plan on flexing it too much.

 

it will work but there are better options than using stock radius arms.