I've posted this before, never any feedback so not sure if anyone has followed through, but this site shows several 4.10 sets. You'd have to pay shipping and I'd ask the seller to provide the best pictures possible of the ring gear to help access wear (possible noise issues).

The search criteria I used was;

1971 Chevy Truck-20 Series , 1971 down to 1967
Carrier
Rear Axle

Good Luck,
Ron

RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5