I had the rattle problem also. I wasn't what it was or where it was coming from. I removed the floor boards and had a friend listen as i drove the car. No rattles. Put the floor boards back and scratched my head. Next time I drove the car rattle-rattle. Decided to change form original...
I had that problem also. I put some WD-40 type oil on the springs. Bought some spring covers. Added some heavy weight oil to the absorbant part of the covers. No more squeaks. Did not take the springs apart.
There might be a little bit more to it than one thinks. The speedometer drive gears aswell as the bearings in the upper drive shaft need lubrication also. Some remove at least (1) bolt from the spedometer drive case and apply grease to what appears to be the u-joint fitting until some shows at...
:(I recently added up the $ I have spent on parts so far on this restoration. I'm making someone a really nice ride. Hope that can afford to keep it on the road.