Speedway Motors sells the teflon liners for a third of what other venders are charging... these are the rolls of black.
The 3600 and the 3100 front springs are supposed to have slightly different spring rates, but after having a set of each disassembled in front of me, I saw no obvious differences between them- same thickness, same length, same arch..... the 1/2 ton were from a '52 and the 3/4 ton were from a '50.
The rear springs on a 3600 are 2.0" wide and are a different length than the 3100 rear springs- so I doubt that they would be interchangeable.
