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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    G80 Factory-verified

    GMC · Regular Production Option

    Axle, rear, locking differential

    Years 1983–91, 1998–10, 2014–27 Models 33 Factory citations 167
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    Also described as Axle, rear, limited slip differentialDifferential, rear, automatic lockingAxle, Positraction limited slipAxle, rear, Positraction, limited slipAxle, rear, PositractionAxle, Positraction, limited slipDifferential, rear, auto-lockingRear axle, locking differentialRear axle, Positraction limited-slipDifferential, rear, heavy-duty locking

    Also documented for BuickCadillacChevroletOldsmobilePontiacSaturn

    Documented applications

    Caballero — G-body (1983–1987)
    • 1983–1987 Factory-verified

      The 1984 order guide prints G8O (letter O); shared G-body platform code; cited from the joint El Camino/Caballero pages of the Chevrolet El Camino kits

      GM Heritage factory kit — 1983 Chevrolet El Camino, p.5.
      GM Heritage factory kit — 1984 Chevrolet El Camino, p.5.
      GM Heritage factory kit — 1985 Chevrolet El Camino, p.11.
      GM Heritage factory kit — 1986 Chevrolet El Camino, p.5.
      GM Heritage factory kit — 1987 Chevrolet El Camino, p.45.
    Canyon — Second generation (GMT31XX) (2015–2022)
    Canyon — Third generation (VSS-T) (2023–2027)
    Canyon — GMT355 (2004–2012)
    Jimmy (full-size) — Square body (1983–1991)
    • 1983–1986, 1990 Factory-verified

      the kits print it as the locking differential; the GMC GMT400 Yukon doc reads it from GM's lists as Positraction; the 1983–1986 price pages print G8O; the 1991 option page prints GaO, so 1991 is left out; shared square-body platform code; cited from the Chevrolet Blazer kit

      GM Heritage factory kit — 1983 Chevrolet Blazer, p.8.
      GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.16.
      GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.10.
      GM Heritage factory kit — 1986 Chevrolet Blazer, p.10.
      GM Heritage factory kit — 1990 Chevrolet Blazer, p.15.
    Jimmy — first generation (1983–1994)
    • 1983, 1985–1986, 1989 Factory-verified

      requires an optional axle ratio; the 1984, 1987 and 1988 joint pages print no legible G80 option line, so those years are left out; 1989 from the joint data book weight page, as its option line runs the code into the name (G80Locking); the 1983, 1985–1986 pages print G8O; shared S/T platform code; cited from the joint S-10/15 Blazer/Jimmy pages of the S-10 Blazer kit

      GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.6.
      GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.14.
      GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.6.
      GM Heritage factory kit — 1989 Chevrolet Blazer, p.15.
    Safari — First generation (1985–1994)
    • 1988–1990 Factory-verified

      the pages print locking differential; Positraction is the reading of the merged Astro and second-generation Safari docs; not with FE3 in 1990; the 1988 page prints G8O; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

      GM Heritage factory kit — 1988 Chevrolet Astro Van, p.6.
      GM Heritage factory kit — 1989 Chevrolet Astro Van, p.12.
      GM Heritage factory kit — 1990 Chevrolet Astro Van, p.7.
    Safari — Second generation (1995–2005)
    Savana — GMT600 (1996–2002)
    Savana — GMT610 (2003–2027)
    Sierra HD — GMT800 (2001–2007)
    Sierra HD — GMT900 (2007–2014)
    Sierra HD — T1XX (2020–2027)
    Sierra — K2XX (2014–2019)
    Sierra — Square body (1983–1991)
    • 1984–1986 Factory-verified

      shared platform code; cited from the square-body C/K pickup kits; the kits print it as the locking differential; the 1983 and 1987 kits print G80 only in power team footnotes that mark teams not available with it, so those years are left out; the kit pages also print G8O

      GM Heritage factory kit — 1984 Chevrolet Truck, p.38.
      GM Heritage factory kit — 1985 Chevrolet Truck, p.37.
      GM Heritage factory kit — 1986 Chevrolet Truck, p.165.
    Sierra — T1XX (2019–2026)
    Sonoma — first generation (1982–1993)
    • 1983–1990 Factory-verified

      the 1986–1987, 1990 pages print G8O; shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

      GM Heritage factory kit — 1983 Chevrolet S 10, p.33.
      GM Heritage factory kit — 1984 Chevrolet S 10, p.14.
      GM Heritage factory kit — 1985 Chevrolet S 10, p.21.
      GM Heritage factory kit — 1986 Chevrolet S 10, p.13.
      GM Heritage factory kit — 1987 Chevrolet S 10, p.20.
      GM Heritage factory kit — 1988 Chevrolet S 10, p.30.
      GM Heritage factory kit — 1989 Chevrolet S 10, p.22.
      GM Heritage factory kit — 1990 Chevrolet S 10, p.20.
    Sonoma — second generation (1994–2004)
    Suburban — Square body (1983–1991)
    • 1983–1991 Single-source

      the GMC GMT400 Suburban doc reads it from GM's 1998–1999 lists as Positraction; the 1983–1988 option pages print G8O (1988 from the January 1988 price page); shared square-body platform code; cited from the Chevrolet Suburban kit; 1991 rests on the Chevrolet-only 1991 Suburban book, so the row is single-source

      GM Heritage factory kit — 1983 Chevrolet Suburban, p.14.
      GM Heritage factory kit — 1984 Chevrolet Suburban, p.16.
      GM Heritage factory kit — 1985 Chevrolet Suburban, p.16.
      GM Heritage factory kit — 1986 Chevrolet Suburban, p.15.
      GM Heritage factory kit — 1987 Chevrolet Suburban, p.22.
      GM Heritage factory kit — 1988 Chevrolet Suburban, p.16.
      GM Heritage factory kit — 1989 Chevrolet Suburban, p.15.
      GM Heritage factory kit — 1990 Chevrolet Suburban, p.18.
      GM Heritage factory kit — 1991 Chevrolet Suburban, p.18.
    Vandura and Rally — Second generation G-series (1983–1996)
    • 1983, 1984, 1986, 1989, 1990 Factory-verified

      the 1983, 1984 and 1986 pages print G8O; 1984 from the February 1984 data book pages in the mislabelled G-Van kit file; shared G-van platform code; cited from the Chevrolet G-Van kit

      GM Heritage factory kit — 1983 Chevrolet Vandura, p.13.
      GM Heritage factory kit — 1985 Chevrolet G Van, p.14.
      GM Heritage factory kit — 1986 Chevrolet G Van, p.21.
      GM Heritage factory kit — 1989 Chevrolet G Van, p.18.
      GM Heritage factory kit — 1990 Chevrolet G Van, p.15.
    Yukon — GMT800 (2000–2006)
    Yukon — K2XX (2015–2020)
    Yukon XL — K2XX (2015–2020)

    Related codes · mentioned in these notes

    1LS1LT1WT2WTFE3GMC

    This page aggregates every documented appearance of G80 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.