Sierra 1500 2WD V8-5.3L VIN Z Flex Fuel (2006)
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Fluid - M/T: Fluid Type Specifications
MANUAL TRANSMISSION (5-SPEED WITH LOW GEAR, RPO MW3)
GM Goodwrench Synthetic Manual Transmission Fluid (GM Part No. U.S. 12346190, in Canada 10953477) or equivalent SAE 75W-85 GL-4 gear oil.
MANUAL TRANSMISSION (5-SPEED WITHOUT LOW GEAR, RPO MG5)
Synchromesh Transmission Fluid (GM Part No. U.S. 12345349, in Canada 10953465).
MANUAL TRANSMISSION (6-SPEED)
Synthetic Transmission Fluid approved to Allison Transmission specification TES-295 (GM Part No. U.S. 12378515, in Canada 88900701).