On a 7 1/4 from a 1973 Dart?

Yes.,,,,

The axle retainers are unbolted and axles can be pulled without removing the rear cover. If the housing is overfilled with oil you will find some dripping out the housing ends after axle removal. ....nothing a coffee can cant handle.....in western Canada some mechanics have been know to use a cocoa tin.....beer can no good

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Yeah....Im the one who destroyed this rare, vintage automobile.....

I drained the oil anyway because the passenger side axle shaft won't pop out.

I can't see any kind of C clip.
If there is a clip, is it at the inner end of the axle shaft, inside the gear it pokes through?

I already tried the reversed drum trick and the driver's side came out easily.

Did the axle retainer come loose OK?
There won't be a C-clip on a 7.25" axle, just the retainer at the outboard end.

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

Here's a photo of an axle shaft with the bearing and retainer. From the left (outboard): Flange (lugs removed, note splines), rectangular retainer plate, bearing, ring, axle shaft. This one took some pulling, but nothing extreme and no special puller.

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

Yes. I removed four nuts, just like the driver's side, and the backing plate is loose.
The driver's side came out with two easy pulls of the drum.