Axle, rear, 3.08 ratio

Years 1984, 1986–92, 1998–02 Models 3 Factory citations 3

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Also documented for Buick Cadillac Chevrolet GMC Oldsmobile

Documented applications

Firebird — Third generation (1982–1992)

1984, 1987–1992 Single-source

Firebird years: thirdgen.org label decodes 1984; 3rdgenformula option pages 1987–1992

Firebird — Fourth generation (1993–2002)

1998–2002 Factory-verified

shared F-body code; Chevrolet Camaro kit

GM factory document — 1998 pontiac firebird rpo code list, p.1.
GM factory document — 2002 pontiac firebird rpo code list, p.1.
GM Heritage factory kit — 1998 Chevrolet Camaro, p.73.

Grand Prix — G-body (1983–1987)

1986 Single-source

the dealer listing of a 1986 2+2 names GU4; Wikipedia gives every 2+2 a 3.08 axle without a code

This page aggregates every documented appearance of GU4 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.