Kurt,
I HAD to replace them all.
Just put them on the front, if the arc on the back ones look good. If you do not mind the extra work, you might want to check the rear pivot bolts/bushings - I have never seen one that was not badly worn. I'll bet you need those bolts/bushings on the front springs.
Check your shackle parts, too (front and rear).
There is a
Tech Tip on making a tool for removing spring bushings from the frame. After breaking two sets made to the specs in the Tech Tip, I made a
beefed-up tool that works like a charm. Send me a Private Message with your address and I'd be pleased to send the bushing remover to you (or to anyone else who will promise to send it back quickly).
