are hf hubs smaller than si/dx hubs?

 

Yes

 

And:
Even though the hub side is smaller,
the HF axles will fit in an Si/DX transmission..

So you could make it work until the Si/DX hubs were avalible..

 

Yep. My car has been running HF axles and hubs and an Si tranny for I don't know how long.

 

All the spline sizes goin into the tranny are the same size then?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr_hahn73 &raquo;</TD></TR><TR><TD CLASS="quote">All the spline sizes goin into the tranny are the same size then?</TD></TR></TABLE>

yes they are,,its only the outer portion of the axles that are different

 

are they weaker? whats the purpose then if all the inners are the same?

 

Lighter weight. Less power stock, no need for heavy axles.