Sierra 3500 4WD V8-6.6L DSL Turbo (2007)
5. Install the oil pump driven gear.
Notice: Do not use an impact driver to remove or install the oil pump driven gear nut. Use of an impact driver may shear the oil pump drive gear
pin in the crankshaft.
6. While holding the secondary oil pump shaft with a hex driver, install the oil pump driven gear nut.
Tighten the nut to 100 N.m (74 lb ft).
7. Install the engine front cover.