i am gona put 5.29's in my 86 toyota, its just a play toy use twice a month, should i replaces seals and bearings too? will it hurt It hurt if I dont change them?

 

i would at least replace the seals. the bearings will probably be fine if there in good shape. look for pitting and flat spots on the bearings. if there is pitting and flat spots replace the bearings. if they still look smooth and shiny there most likely fine...