If you can find a good truck axle/gear repair shop you should be able to trust them in doing a good job. You could ask folks who know, which is stronger, your 10.5 Ford or a Dana 80.
I would be scared of a junkyard axle, for already mentioned reasons. Also, I was told by my gear shop that the LH carrier bearing commonly goes out (race spins on the carrier and wrecks the carrier)(ring gear pushes to the left on acceleration) on all pick-up axles from any amount of towing. You have to get up to 2 ton trucks I guess to find bearing races that have tabs to keep them from spinning.
If you think the parts are expensive, wait until you get a labor estimate. (lots of labor involved in setting up gears) But, I would pay a good shop if I didn't know how.
Also, Tractor Vet mentioned the crush spacer. I have heard drag racers replacing the crush spacer with a solid spacer because their acceleration forces will crush it. Your pinion bearings could have gone also, allowing the pinion to flop around. So, since you have all that power, you could have crushed the crush spacer. You could visit with someone knowledgeable about using a solid spacer.
I feel your pain, I have had my 9" Ford rebuilt twice in the last 40K miles (pinion bearings first, then carrier bearing) and I have just been tugging around a JD A or a Farmall M or a car. (stock motor: 351M boat anchor)
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