I am still researching what to do with it, in E53 the chain replacement costs about a $300 and seems fairly easy. I may just do that on my transfer case. I will let you guys know what I end up doing I am going to take my time and do some research, a rebuilt E70 transfer case costs $1200 or so, don't know if I will do that, can get a used transfer case from a auto parts recyclers some offer 6 month warranty.