3 WORST and 4 BEST GMC Powertrains You Can Buy

Описание: GM paired a perfectly good engine with the wrong transmission — and owners are paying twelve thousand dollars for that mistake.

I've torn apart every powertrain combo they sell. Three are at war with themselves. Four will outlast the frame, the body, and your patience for oil changes.

WHAT THIS VIDEO COVERS:
• Why engine + transmission pairing matters more than either component alone
• The combos where engine and transmission literally destroy each other
• Torque converter shudder, AFM lifter failures, and calibration nightmares
• The powertrain combos that routinely hit 300K-400K miles
• Exact model years to buy and which to walk away from

THE 3 WORST COMBOS:
• 5.3L AFM + 8L90 8-Speed (2015-2019) — AFM lifters + torque converter shudder = $12K combined
• 2.7L Turbo + 8-Speed (2019-2021) — Turbo mismatch, HPFP failures, worse MPG than the V8
• 6.2L + 10L80 10-Speed (2019-2021) — $60K Denali with base-model reliability

THE 4 BEST COMBOS:
• 6.0L Vortec + 6L90 (2009-2013) — No AFM, HD trans, 400K+ miles on fleet trucks
• 5.3L + 6L80 Pre-AFM (2007-2013) — The sweet spot, proven 300K combo
• 6.6L Duramax L5P + Allison 10-Speed (2020+) — Best diesel powertrain GM ever built
• 6.2L + 10L80 (2022+) — Same combo, fixed calibration, different truck entirely

⚠️ The 6.2L + 10-speed appears on BOTH lists. The model year changes everything.

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