The heavy rear axles are call 'full floating' axles, this means that the axle shafts carry no weight, they only transmit torque. Fastest, least expensive would be cut the flange off and use it to re-seal the tube end. The hub bearing at the end of the axle carries all of the weight.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy