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| Submodel | Resale Range | Trade-in Range |
| 2008 Sierra 1500 4WD 2-Dr Reg Cab Long V6 | $12,330 - $16,660 | $9,970 - $14,300 |
| 2008 Sierra 1500 2WD 4-Dr Ext Cab Std V8 | $12,190 - $23,810 | $9,790 - $20,660 |
| 2008 Sierra 1500 4WD 4-Dr Reg Cab Std V6 | $13,270 - $17,600 | $10,670 - $15,000 |
| 2008 Sierra 3500 2WD 2-Dr Reg Cab Long V8 | $13,050 - $20,070 | $10,760 - $17,430 |
| 2008 Sierra 2500 HD 2WD 4-Dr Crew Cab Std V8 | $19,390 - $31,220 | $16,090 - $27,810 |
| 2008 Sierra 2500 HD 2WD 4-Dr Ext Cab Std V8 | $16,720 - $27,430 | $13,820 - $24,150 |
| 2008 Sierra 3500 HD 4WD 4-Dr Ext Cab Long V8 | $20,580 - $33,610 | $17,030 - $29,440 |
| 2008 Sierra 1500 4WD 4-Dr Ext Cab Std V6 | N/A - N/A | N/A - N/A |
| 2008 Sierra 2500 HD 2WD 4-Dr Crew Cab Long V8 | $21,330 - $30,990 | $17,590 - $26,940 |
| 2008 Sierra 2500 HD 2WD 4-Dr Ext Cab Long V8 | $16,640 - $27,200 | $13,740 - $23,920 |
| 2008 Sierra 2500 HD 4WD 4-Dr Crew Cab Std V8 | $22,610 - $35,570 | $18,760 - $31,610 |
| 2008 Sierra 1500 2WD 4-Dr Ext Cab Short V8 | $15,500 - $23,890 | $12,600 - $20,690 |
| 2008 Sierra 1500 4WD 4-Dr Ext Cab Long V8 | $16,430 - $27,190 | $13,390 - $23,640 |
| 2008 Sierra 2500 HD 4WD 4-Dr Crew Cab Long V8 | $24,540 - $35,300 | $20,240 - $30,690 |
| 2008 Sierra Denali 2WD 4-Dr Crew Cab Short V8 | $25,270 - $34,300 | $21,790 - $30,820 |
| 2008 Sierra 1500 2WD 4-Dr Ext Cab Long V8 | $13,540 - $22,860 | $10,960 - $19,870 |
| 2008 Sierra 1500 4WD 4-Dr Crew Cab Short V8 | $19,450 - $31,800 | $15,890 - $27,760 |
| 2008 Sierra 1500 4WD 4-Dr Ext Cab Short V8 | $16,800 - $28,210 | $13,650 - $24,470 |
| 2008 Sierra 2500 HD 4WD 2-Dr Reg Cab Long V8 | $15,900 - $23,730 | $13,040 - $20,560 |
| 2008 Sierra 1500 2WD 4-Dr Ext Cab Short V6 | $13,110 - $17,440 | $10,650 - $14,980 |
| 2008 Sierra 1500 4WD 2-Dr Reg Cab Std V8 | $15,630 - $20,670 | $12,630 - $17,670 |
| 2008 Sierra 2500 HD 4WD 4-Dr Ext Cab Std V8 | $19,980 - $31,770 | $16,490 - $27,940 |
| 2008 Sierra 1500 2WD 4-Dr Ext Cab Std V6 | $12,850 - $17,180 | $10,450 - $14,780 |
| 2008 Sierra 3500 HD 4WD 4-Dr Crew Cab Long V8 | $20,280 - $37,320 | $16,840 - $33,100 |
| 2008 Sierra 1500 2WD 2-Dr Reg Cab Long V6 | $9,140 - $12,020 | $7,410 - $10,290 |
| 2008 Sierra 3500 HD 2WD 4-Dr Ext Cab Long V8 | $17,340 - $29,270 | $14,360 - $25,660 |
| 2008 Sierra Denali AWD 4-Dr Crew Cab Short V8 | $27,370 - $37,160 | $23,640 - $33,440 |
| 2008 Sierra 1500 2WD 4-Dr Crew Cab Short V8 | $16,370 - $27,460 | $13,360 - $23,960 |
| 2008 Sierra 1500 4WD 4-Dr Ext Cab Std V8 | $16,570 - $28,180 | $13,480 - $24,470 |
| 2008 Sierra 3500 HD 4WD 2-Dr Reg Cab Long V8 | $16,300 - $25,670 | $13,400 - $22,240 |
| 2008 Sierra 2500 HD 4WD 4-Dr Ext Cab Long V8 | $19,900 - $31,540 | $16,410 - $27,710 |
| 2008 Sierra 1500 2WD 2-Dr Reg Cab Long V8 | N/A - N/A | N/A - N/A |
| 2008 Sierra 2500 HD 2WD 2-Dr Reg Cab Long V8 | $12,460 - $19,430 | $10,200 - $16,850 |
| 2008 Sierra 1500 2WD 2-Dr Reg Cab Std V6 | $9,830 - $13,440 | $7,830 - $11,440 |
| 2008 Sierra 1500 2WD 2-Dr Reg Cab Std V8 | N/A - N/A | N/A - N/A |
| 2008 Sierra 1500 2WD 4-Dr Reg Cab Std V8 | N/A - N/A | N/A - N/A |
| 2008 Sierra 1500 4WD 2-Dr Reg Cab Long V8 | $11,810 - $20,040 | $9,580 - $17,190 |
| 2008 Sierra 3500 HD 2WD 4-Dr Crew Cab Long V8 | N/A - N/A | N/A - N/A |
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