Rear end advice for racing with a 4 speed

By the time I narrowed a dana, bought gun drilled axles from Moser and installed rear disc brake setup I was within 10 lbs of the 8.75. I got tired of fixing the 8.75 and decided to go dana. Have not worked on the rear axle since except for lube change. The axles from Moser came with a 10 year warranty.