LK5
2.8L I4 ENGINE CODE
*Supplied by GM  

??
  i-280 Ext Cab RWD 2006

LLV
2.9L I4 ENGINE CODE
*Supplied by GM  

??
  i-290 Ext Cab RWD 07-08

L52
3.5L I5 ENGINE CODE
*Supplied by GM  

??
  i-350 Crew Cab 4WD 2006

LLR
3.7L I5 ENGINE CODE
*Supplied by GM  

??
  i-370 Ext Cab RWD 07-08
  i-370 Crew Cab RWD 07-08
  i-370 Crew Cab 4WD 07-08