The loads on the "C" clip axles at the C clip probably isn't very high under normal conditions. If you are circle tack racing, or doing hard corners on blacktop, constantly, the C clip may be a weak point, at some point, maybe.

Probably the weakest point on a 9 1/4 is the axle bearings running on the axle surface, or the crush sleeve at the pinion gear collapsing and allowing the drive shaft flange to loosen up and drop the pinion back into the housing. Those are the two most frequent failures I've seen on Mopar 9 1/4 rear ends, and for as many of these rear ends as I've seen, it probably wasn't much of an issue.

I would not be concerned with a 9 1/4 under a Ramcharger with a big block, unless drag racing was the main intended purpose. Regardless of the opinion of many on this board, a 9 1/4 is a tough rear end. Gene