Mark, I may have the liners done with the new springs. The reading on Eaton's site is pretty interesting regarding the liners, slip pads, grease, etc.
For example, back in the day, I used to grease between the leaves or shoot oil in every crack and crevis to make my old '58 ride smooth and squeak free.
(along with concrete blocks in the bed) What I didn't know then, was the oil and grease will break down chrome carbon steel!
According to Eaton, you can tell if a big leaf spring truck has had a long term power steering leak by noticing a sagging front end on the same side as the power steering pump!
Do you remember when the trick of the week was disassembling the leaves, packing with grease, reassembling and wrapping with wide electrical tape to waterproof? Haa