KevinK2

I recall after I lowered the car with the Comp Dept 550 lbs/in front springs, and the swing-spring with longer Spitfire axles, I found that the 1500 had larger shoes and cylinder dia vs the 68 GT6 oem, so I went with that. With the car lowered, less weight tranfer to front when braking, so the larger spit cylinders helped prevent front tire lock-up.

I think the waterproof grease is designed to have an oil wick out and lubricate the bearings based on a thin oil film. The leaf spring application is just short displacement back and forth motion, which is considered "boundary lubrication". For that you need something like anti-seeze paste for bolts, with high solids content. I When I seviced the "swing spring" I used in my 68 GT6 (with longer Spitfire half shafts) I though there were thin, round pads between leaf's, not sure. I was installing a new pad between bottom spring and top of diff, to eliminate static chassis lean.