My first choice would be a milling machine and the appropriate size end mill.
Second choice is what they sometimes call a "West Virginia milling machine" also known as a file, a rat tail file in this case.

I'd be quite scared of using the torch to cut a front axle if I then planned to use the axle. eeeek

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-