will the rear spindles off of an 03 blaster fit on a 99 warrior axle?

 

You mean the rear hubs? I'm not sure, but I dont think they will work. If they do fit the axle, then you have to worry about wheel bolt pattern. Blasters came with 8" wheels and Warriors came with 9" wheels and I think the bolt pattern is different.

 

NO. It will not work, for the reason stated above, but I also believe the spline count is different.