bobby birfs are better then the bell feild I think..Just my 
I would swap out the stockers asap..If you keep them good before you swap out to the 30 spline you will have a good set of inner and outers as spares..Or send your birfs and have bubby excabge them ..but if you got the money go 30 spline..I am very happy with mine..
What are bobby birfs?
I have maybe 3 different sets of front axles for spares, but I would just like to make it very unlikely to have to change one.
About the 30 spline... is the differential 30 spline and not the birfs? are the birfs like 27 spline?
I don't think I can exchange them, since I am in Canada and the sellers probobly live in the US somewheres.
