I only used it twice last year on dry roads. There is no way I wanted to use a 4 place enclosed without brakes this year! A little dangerous if used on a snow covered road. I went with 2 new hubs and all new seals. Should be good to go after I adjust the brakes.5 years, if you got through last year don't bother fixing them
because they probably didn't work last year.
Just kidding, but it might be time to replace the inner seals while the hubs are off just to keep the slickery stuff in.