Regular Cab
1987-1996

Macrocab
1988-1994

G63B
2.0L I4 ENGINE CODE  

??
  Truck Reg Cab S/B RWD 87-89
  Truck Reg Cab L/B RWD 87-89

4G64
2.4L I4 ENGINE CODE  

??
  Truck Reg Cab S/B RWD 90-96
  Truck Reg Cab L/B RWD 90-92
  Truck Macrocab RWD 90-94

4G54
2.6L I4 ENGINE CODE  

??
  Truck Reg Cab S/B RWD 87-89
  Truck Reg Cab S/B 4WD 87-89
  Truck Reg Cab L/B RWD 87-89
  Truck Reg Cab L/B 4WD 87-89
  Truck Macrocab RWD 88-89
  Truck Macrocab 4WD 88-89

6G72
3.0L V6 ENGINE CODE  

??
  Truck Reg Cab S/B 4WD 90-94