Like hillbilly6.0 said, stock shocks are to short. With the 2 inches of cranking he will put on the front end the shock just extended another 2 inches also. Which pretty much maxes the up travel of the stock shocks out.
Cliff notes:
stock front shocks+2 inch crank= really ruff ride
2002 Silverado 2500HD LB7 CCSB LT
EFI Live by Rob at ATP, Edge CTS Insight DSP 5 control, S&B CAI, PPE boost valve, Pro Fab AIH, AirDog II 165, PPE WIF sensor delete plug, 5" stainless exhaust, Cognito braces & HD tie rods, H2's 315/70 R17 BFG's
2004 Tahoe LT
2006 Silverado Z71 LS
1971 Chevy C10