| NA TRUC | ||||||||
| MID RAN | ||||||||
| ENGINE | 1996 | 1997 | 1998 | 1999 | ||||
| MAKE | MODEL | HP | LITERS | CYL | UNITS | UNITS | UNITS | UNITS |
| CATERPLLAR | 3126 | 190 | 7.2 | 6 | 225 | 981 | 6,197 | 13,403 |
| CATERPLLAR | 3126 | 210 | 7.2 | 6 | 660 | 2,170 | 6,197 | 13,403 |
| NAVISTAR INTL | DT466 | 215 | 7.6 | 6 | - | - | - | 1,157 |
| NAVISTAR INTL | DT466 | 230 | 7.6 | 6 | 4,560 | 4,209 | 6,022 | 6,324 |
| CUMMINS | N SERIES | 435 | 14 | 6 | 6,848 | 5,308 | 9,093 | 8,808 |
| CUMMINS | N SERIES | 447 | 14 | 6 | 1,035 | 90 | - | - |
| DETROIT DIESEL | SERIES 60 | 400 | 12.7 | 6 | 1,725 | 1,858 | 2,258 | 3,213 |
| DETROIT DIESEL | SERIES 60 | 430 | 12.7 | 6 | 17,865 | 26,708 | 32,836 | 45,457 |
| MACK | E7-275-325 | 275-325 | 11.9 | 6 | 104 | 48 | 33 | 60 |
| MACK | E7-300 | 300 | 11.9 | 6 | 1,768 | 2,325 | 2,063 | 3,196 |