My Rzr 900 front diff didn't survive the trail this hunting season and was a total loss. My choice was to buy a replacement for $1400 or upgrade to the Rzr 1000 front diff for the same price. The 1000 Diff is reported to be 80% stronger but unfortunately it's much bigger and requires extensive cutting and welding make it work. I used the Gilbert's Design modification kit made of 3/16 steel to make the job much easier and it's now much stronger then stock. It takes about a 10 hours to complete the job but hopefully it won't break again. If your differential craps out on you or you plan to install very aggressive tires you might want to consider the same swap.