Most spools or lincoln locked diffs, aren't road friendly. If your axles hold up to the abuse, then your tires are gonna suffer. And let's forget about when the road is covered in ice or snow! Your safer and better to get a selectable locker, I know they are not cheap, but it will save $$ in the long run in repairs or worn out tires! There are alot of people that are running locked up axles on the road, and haven't had any problems, but you need to look at their driving habits too!