Need help. Setting up new gear set 742 case

When I put it together I used my impact and just snugged the pinion nut. I had my backlash set at .008 and my pattern looked good. That's when I went to torque the pinion nut and realized the pinion preload was wrong. I will add shims and try again tomorrow, This is my first one. Big learning curve. You can read all of the articles you want. Only really makes sense when you pull one apart yourself. I'll update tomorrow. Thanks for the replies.