I have a '69 Coronet R/T, 440/Hemi 4 speed, 3.54 Dana. It has Super Stock springs, soon to get a tall, sticky tire on it, and more than a little abuse. I put new u-joints in it when I put the driveshaft in it, and used the greasable ones. After I did, someone told me in a 4 speed car you ALWAYS...