Reply to "zf output shafts and Half shafts"

The stock half shafts are reputed to be good to 800HP. Lots of people changed to Spicer half shafts and you will often hear they are better, but that is mostly a myth carried over from a time when the stock u-joints were so costly it was cheaper to buy the Spicer shafts. IMHO there isn't much between the two, now stock style u-joints are cheap and readily available.

CV joints are a more modern and better alternative, but not a necessity. If you do change to CV's and as you need to replace one output shaft anyway you could consider also switching to CV flange output shafts.

The cheapest bolt in alternative for CV shafts are the ones from SACOPerformance http://www.sacoperformance.com/products.php?cat=51 They will bolt straight up to you existing flanges.

There are usually used half shafts on the market for around $150 a pair. Where did your existing half shaft break?

Julian