Use 7018 (low hydrogen) rod when welding to the knuckle. And whatever you do, stay away from aluminum driveshafts...
SVT
What's wrong with aluminum driveshafts? (serious question) They will handle the torque he is going to be dishing out, and unless he is rockcrawling over some crazy gnarly shiz, he should be fine. Besides, as a cheap alternative to a custom shaft, he can pick one up for $50 around here. Custom shafts, like Woody's, can run a few hundred dollars, plus shipping.
He has a 2WD '93. He'll just need to get rid of the carrier bearing and crossmember to fit it (after making room for the transfercase, which he will need to cut anyways). Also, with a 1-piece shaft, his driveshaft's pinion angle
will not nearly be as wonky. Less angle = less vibration at cruising RPM, even if it IS properly counter-balanced.
SVT, on our Rangers with stock 4x4, we have a steel gas tank plate that protects the gas tank. However, on single driveshafts, the plate interferes / grinds with the driveshaft under major articulation. So, the solution is to grind/shave our gas tank skid plates by about 0.75" - 1.00". He doesn't have that problem.
Alum shafts have less mass than steel, but hold the same structural integrity and capacity of the latter. In some cases, like 2WD applications, aluminum shafts have a larger OD and a thin wall to accommodate more torque despite how light they are. This is an engineering aspect of diameter, material strength, material mass, and force that the shaft is subjected to. I have the calculations on hand that show this relationship. Pound for pound, aluminum is stronger than steel in any case.
Steel is usually more "ding resistant" than steel, but aside from that, there is no other advantage. Armadillon, how much are you gonna be high centering your rig?
NOTE: SVT, not causing an argument. I'm just curious why you are so pro steel. I'd go with whatever is cheaper and works. You've got 225 ft-lbs going through your drivetrain, the OP has a 3.0L. Good call on the low hydrogen, BTW.
