6L80 vs 6R80: GM vs Ford 6-Speed Comparison

The GM 6L80 and Ford 6R80 are both 6-speed automatics in popular pickup trucks. Heres how they compare for owners, swap-builders, and tuners.

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Production years and applications

6L80 (GM):

  • 2006-2017 main production
  • Silverado 1500, Tahoe, Suburban
  • Camaro SS, CTS-V
  • ~440 ft-lb stock

    • 6R80 (Ford):

  • 2009-2017 main production
  • F-150, Expedition
  • Mustang GT (2011-2017)
  • ~520 ft-lb stock

    • Stock torque rating

    6L80:

  • 440 ft-lb
  • HD-built: 700 ft-lb

    • 6R80:

  • 520 ft-lb (higher stock)
  • HD-built: 750 ft-lb

    • 6R80 wins stock capacity

    Tuning headroom

    6L80:

  • Tune + bolt-ons: 500 HP OK
  • Forced induction: HD required

    • 6R80:

  • Tune + bolt-ons: 550 HP OK
  • 5.0L Coyote handles tune well
  • Ecoboost tuned hard: HD needed

    • Fluid spec

    6L80:

  • Dexron VI
  • $7-$10/qt

    • 6R80:

  • Mercon LV (newer years)
  • Mercon V (early)
  • $10-$15/qt
  • Critical: wrong Mercon = shudder

    • Service interval

    Both:

  • Factory "lifetime" claim is wrong
  • Real interval: 50-60k miles
  • Tow: 30k miles

    • Common failures

    6L80:

  • TEHCM (mechatronic)
  • TCC clutch shudder
  • Solenoid pack

    • 6R80:

  • Solenoid pack
  • TCC shudder
  • Internal harness

    • Aftermarket support

    6L80:

  • Strong aftermarket (Sonnax, BD, RPM)
  • HD parts available
  • Triple-disc converters

    • 6R80:

  • Smaller aftermarket
  • HD parts available but fewer options
  • Coyote performance community helps

    • Rebuild cost

    6L80:

  • Stock: $2,500-$3,800
  • HD: $3,800-$5,500

    • 6R80:

  • Stock: $2,800-$4,200
  • HD: $4,000-$6,000

    • Tuning platforms

    6L80:

  • HP Tuners (primary)
  • EFI Live (some support)

    • 6R80:

  • SCT Tuner
  • HP Tuners
  • Wider Ford support

    • Swap considerations

    6L80 swap:

  • LS engine compatible only
  • Modern wiring needed
  • Standalone TCM available (limited)

    • 6R80 swap:

  • Coyote / 5.4L compatible
  • Ford ecosystem fits
  • Standalone TCM exists

    • Which is more reliable

    6L80 (longer production data):

  • TEHCM failures known
  • Solenoid pack premature wear
  • Generally 120-180k mile rebuild

    • 6R80:

  • Generally more reliable
  • 180-220k mile rebuild typical
  • Less mechatronic issues

    • 6R80 wins reliability

    Which is better for tow

    6L80:

  • OK to 8,000 lbs sustained
  • HD-built to 12,000 lbs

    • 6R80:

  • OK to 10,000 lbs sustained
  • HD-built to 14,000 lbs

    • 6R80 wins for tow

    Bottom line

    If you own one already:

  • Keep it
  • Service properly
  • Both rebuild similarly

    • If choosing between trucks:

  • 6R80 has slight edge in stock capacity
  • 6L80 has more aftermarket HD options
  • Pick truck based on engine preference

    • If swapping:

  • Match to engine origin
  • LS = 6L80
  • Coyote = 6R80

    • Need 6L80 or 6R80 rebuild parts? Shop our catalogs: 6L80 | 6R80. Master kits, HD upgrades, complete rebuild bundles. Free shipping over $70.

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