Limited-slip differential

Years 1971–82, 1987, 2004–07 Models 5 Factory citations 3

Also described as Positive traction differential (RPO)Axle, Positraction, limited slipAxle, rear, limited slip differential

Also documented for Cadillac Chevrolet GMC Oldsmobile Pontiac Saturn

Documented applications

Full-Size — LeSabre / Electra / Wildcat

1971–1976 Confirmed

Full-size
1977–1982 Confirmed

Full-size

Regal / Century

1973–1977 Confirmed

Century/Regal
1978–1982 Confirmed

Regal, Century to 1981

Riviera

1971–1976 Confirmed

Riviera

Rainier — GMT360 (2004–2007)

2004–2007 Factory-verified

GM factory document — 2004 buick rainier 2wd rpo code list, p.1.
GM factory document — 2007 buick rainier rpo code list, p.1.

Regal — G-body (1983–1987)

1987 Factory-verified

gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit

GM Heritage factory kit — 1987 Chevrolet Monte Carlo, p.40.

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