I have a 1966 CJ5 that has Summers Brothers aftermarket 1 piece flanged axles in the dana 44 rear and dana 27 front with t-10 4 speed, warn overdrive unit, and dana 18 transfer case. My father had engine swapped a previous 350 sbc to a solid tappet 406 small block chevy that makes approximately 500-550 flywheel hp. It was only broken in about 20 years ago then sat in my parents garage. I just got it running again and broke the dana 27 in my gravel driveway very quickly... the pinion snapped and part of it went through the iron housing. I was wondering if I should swap a lower horsepower motor into it like a fuel injected v6 or what front axle would be sufficient to not break again without going 37s? The jeep currently sits on 33x12.5r15 Mudstar tires and I'm not really interested in running super a wide stance. Side note, it has 1966 Corvair Steering Column from what I can tell. It has the stock 5.38 gearing with limited slip rear. Also I'm not sure if the 1 piece dana 44 axles are course spline or if that carrier was swapped out at some point with the newer axles. I'm guessing the former. The drum brakes on all 4 corners are 11x2 inch. also. I was looking into dana 60 front axles but the housing sits so low and everyone seems to recommend against it with less than 37s due to reduced ground clearance. I'm concerned that a dana 44 or 10 bolt front axle would be marginal with the torque put out by this motor.