Did you end up running the shift cable like this ? Where it goes through the firewall above the trans tunnel ?
http://comancheclub.com/topic/44456-aw4-shift-cable-woes/?fromsearch=1
It seems like if it goes from the drives side , over the booster that is will have too many bends and possibly bind . This isn't the first time you broke a cable right ? It's either a binding problem , getting melted or inferior cables IMO .