most of the time the spider gears will break when welded .as the other man said since you are having gears put in do a posi or locker .or you could use a mini spool the cheap way out but not recomended for the street
This is very dangerous. There is a very good reason why the NHRA does not allow welded gears. You can not weld heat treatred steel and expect it to be strong. The gears will bust and you will tear up a lot of parts, and possibly kill someone.