I am about to change out both right and left CV axels on my 2002 Bonneville. I understand that transmission fluid will come out when I remove the old ones. what the manuals and videos don't tell me is how much will come out. How much do I need to buy before starting the job. will one quart be enough or do I need more?? Would also be interested in any advice from someone who has done this job before. is it really as simple as it seems?