Will a 95 Tahoe rear end fit 03 silverado 1500?

No, a 1995 Tahoe rear end will likely not fit a 2003 Silverado 1500 without significant modifications, if at all. While both are GM trucks, the chassis and axle designs changed considerably between those years. The bolt patterns, spring perches, and overall dimensions are almost certainly different. Even if you could get it bolted in, the driveshaft length and pinion angle would be wrong, making it unsafe and unreliable.