Sonnax High Performance Product Line Manager, Gregg Nader, delivers an in-depth look at four popular GM 6L80-series transmission upgrades and repairs. Featured products include the heavy-duty 4-5-6 clutch apply piston kit, high-strength pump slide spring, proven line pressure booster kit and award-winning Zip Kit®.
I work on transmissions for a living.
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I work on my own vehicle(s) only.
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