C10 rear suspension

[aintnoV8]

hello. im not very firmiliar with c10 pickups, so i was hoping you guys could give me some info. im looking for a chevy rear axle that was on a c10 pickup in the early 60's that had leaf springs. i have read in other forums that this was an option back then. i got a 57 chevy project truck and im looking for a better geared rear end (57 stock rear was a 3.90). can anyone tell me which year(s) had leaf springs. it would make my junk yard search a little easier if i had specific years. thanks.