C5 & C6 DIFFERENTIAL HEAVY DUTY OUTPUT SHAFT $295.99 97-07 Heavy Duty Differential RH Axle Upgrade $297.95 97-07 RH Axle Shaft Gear Upgrade $397.95 1997-2007 3.42 PERFORMANCE RING & PINION $395.95 1997-2007 3.73 PERFORMANCE RING & PINION $395.95 1997-2007 3.90 PERFORMANCE RING & PINION $395.95 1997-2007 4.10 PERFORMANCE RING & PINION $395.95