This is what I've been using on my Savage:
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXLME0
One did break on me but that was the result of a 35mph crash into a curb. That same crash also broke a shock shaft and bent hinge pins.
If you don't want to go with that style of axle, HPI also makes them with the regular style of axle:
http://www3.towerhobbies.com/cgi-bin...?&I=LXLHF3&P=7
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz