cracked final drive housing ??

Changing bearings in the final drive on my 300trx 2wd and noticed a hairline crack when I went to put the new needle bearing in for the pinion. Crack is right down the middle beween the hole where the c clip is to where the pinion goes into the bearing. Question is, will the hairline crack be a major issue or just keep going? A new housing is 150 and I have a lot more to buy to get it going so anywhere I can save a dollar is great