Sierra 1500 4WD V8-6.0L VIN U (2006)
1. Remove the transmission filter.
2. Remove the valve body.
Important: The 1-2 accumulator can be removed without removing the valve body.
3. Remove the accumulator cover bolts.
4. Remove the 1-2 accumulator cover.
5. Remove the 1-2 accumulator cover (57) and pin.
Important: Regular production option (RPO) M33 transmissions do not use a 1-2 accumulator spring inner (104).
6. Disassemble the 1-2 accumulator assembly (54, 56, 57, 104).
7. Inspect the 1-2 accumulator springs for cracks.
8. Remove the 1-2 accumulator piston seal (1) from the 1-2 accumulator piston.
9. Inspect the 1-2 accumulator piston for the following conditions:
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Porosity
^
Cracks
