The spring shop told you the basic truth, that friction acts as a shock absorber so they don't flex too fast. Lubing spring leaves can make them exceed their rating and eventually cause them to break.
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did anyone ever find the part number for the shackle bushings?
digging this one back up. Looking for the shackle bushing #'s and bolt #'s
I used Moog SB319 for front shackle.
awesome thanks man!