Oldcreek,
Are you indicating you are starting out in first gear, which is 'grandmother' and shifting to second gear, and this is the difficult one.
I don't think the normal, everyday drill would be to start in 1st gear...this is usually reserved for climbing trees.
As I recall, this shift from granny to 2nd is stiffer than most because of the drastic ratio change involved.
If this is not the case, then the second gear synchro would be the obvious next choice.
Have you verified that the transmission is full of the proper lube.
I was absent the day they taught "SM-420's" so I might be all wet.
Stuart