Slick 60's

yes was an option
5400 gvwr i think
had them on my wifes 66 f100 4x4, i scaled 7219 at the scrap metal yard, had plenty of spring left

On my 61 f100 4x4 too

Never scaled it, but I have had a big load of firewood on it
Didn't squat hardly at all

Yep, my F100 Camper Special has ten leaf rear springs but I believe the rear axle rating was still 3300; I'll have to check on that and the GVWR!
Paul

I guess i could have put them on my 65,but not planning to work the old girl that hard.A couple of the rubber bumpers are missing but i suppose you can still find them.