It's the metal around the tubes that rusts out it seems. The plugs only keep the inside of the tube dry and free of dirt. Not sure why the rocker metal rusts. Maybe water gets under the paint or undercoating where the tube protrudes.
Regarding lifting, I lift on or near the front subframe mounts - there is room for jack and stands. For rear, if I want both sides raised, I
lift under diff and then put jack stands at subframe mounts. I wouldn't put jackstands under the rockers on a car of this age
Starting to think that filling jack holes, then fairing in over depression around tubes so rockers are smooth on outside may be an option. That would perhaps solve one rust problem!
47dodge said
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Mine are in good shape, and the one that was not good I put all new metal in. made it out of stainless that I formed to fit.
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Did you weld stainless to the steel rockers?
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5