yeah why not, its as strong as a toyota axle. the 4.10 (toyota) is the strongest from what i have seen, also the fastest (unfortunatly), i run them for strength and gear my tranfer cases (yes more than one with 4.7's in the back case) for a final drive of over 207:1, so way the heck down for crawling and thats with stock axle shafts . doesnt help that i am running 40 inch tires either. however the l16 has a 4.375 ratio in their rear end and i have a few of those laying around here. i will go take some measurements for my brother. but at least i have them here and we dont have to buy anything haha. and at minimum the 521 was rated as half ton rear end.... he wont be pulling that nor can he fit a half ton of anything in the car. and he wont have enough traction to shear the shaft off at the splines because the car doesnt weigh enough. haha i think it will be able to handle it. if need be we can make something else.
any ideas on it? more than happy to for more information on the actual strength of the datsun axles?