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Engines & Drivetrain

Tech for the 5.3L (L83), 6.2L (L86), and 4.3L V6. Tuning and 6L80 / 8L90 transmission support.


2,739 topics in this forum

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  1. 6L80/90 tech info

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  2. Anyone seen this?

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  3. Clunk under truck

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  4. Transmission temp 1 2 3 4

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  5. OVER MY GMC SIERRA 1 2

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  6. Injectors 1 2

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  7. Question

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  8. Emissions

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  9. A/C leak stop

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  10. Exhaust Questions

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