Does anyone know if an 81 axle shaft, spider gears, carrier will fit into a 92 pumpkin? Any help would be appreciated!!

No it won't. The splines are the same but the length is different. The axle gears and differential are also different. The '92 has the 7 5/8 10 bolt and the '81 has the 8.5 10 bolt. You will need parts from a '90-'92 Camaro or Firebird. The axles were changed from 26 to 28 splines in '89.