Sierra 3500 4WD V8-6.0L VIN U (2004)
7. Remove the transmission cover bolt.
8. If equipped, remove the oil pan skid plate bolts.
9. Remove the oil pan skid plate.
10. Remove the crossbar bolts.
11. Remove the crossbar.
12. Remove the transmission cover bolt and cover.
13. Drain the engine oil and remove the engine oil filter.
14. Re-install the drain plug and oil filter until snug.