What he ^ said.
The way they'd go about it is to either change the yoke on the driveshaft to match the rear axle or possibly use a u-joint that's one size on one part of the cross and another size on the other part to match up. You'll likely be messing with the driveshaft anyway, so welding on a new matching yoke isn't that big a deal.

Messing with the yoke on the rear axle potentially introduces issues with bearing preload or pinion seal.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.