I swaped a '60 3.90 third member into my '53 rearend. I know that same axle goes up to '62. I'm not sure where it starts, but that shouldn't matter because you want to go as new as possible for a higher gear set.
Good Luck.
Real easy swap.
The more I think about it, I think they went to a 3.90 gear set in '55.2
I think thats what steppenwood put in his truck aswell.
So anywhere from '55.2- '62 should work.
And as I think about it even more, you have to go newer then '55.2 because thats when they put in the open driveline.
I think I think to much...(editx4)