I have looked into it, and it seems everyone has been trying to go the opposite way, so I haven't found a difinitive answer. I have a 90 10b 30 spline 6 lug front with 3.73 gears. I am going to be doing the conversion to 8 lug and got the parts from a 86 or 87 I believe. I also pulled the carrier, gears (4.10), and shafts(28 spline). I lived in an apt, so I couldn't handle the whole axle. I would like to change to 4.10 gears. Can I change the carrier and gears from the 30 spline to the 28 spline?