You could also swap in a one peice axle like a TJ. Or even make your 2 peice into a 1 peice but making the colar stay over the 2 axle peices. I have done the later using a heavy duty bolt to hold the fork/collar in place. I haven't noticed a change in MPG or had problems with my D30 locker (Aussie).
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95 YJ, D30/8.8 w/ 4.88s, SOA, 35x14.50x16.5 Pit Bull Mud Dawgs, 101" Wheelbase, Custom Front Bumper, Winch, Custom Rear Tow Points, Traction Bar, Aussie Locker in front, 20 Gal. Gas Tank modification, Hurculiner Tub, Custom Rear Bumper, SYE and CV shaft, BTF Cross-over Steering, RCI 2191 fuel cell, BTF Rockers, RE 1.5" SOA springs up front and XJ springs in the rear
Down the line a bit...engine swap, the list goes on.