Tick will tell you they aren't needed for 1-2, not sure what the reasoning is. I wouldn't worry about brand, get them where you want. I HIGHLY suggest the gear box. Kevin has excellent customer service and good prices. Mine has billet on 1-2 and 3-4, stock on 5-6 and reverse.
2001 Silverado ECSB 5.3L 2WD
1999 Hugger Orange Camaro Z28 427ci - SOLD