Y4D ✓ Factory-verified

Pontiac · Regular Production Option

Axle, torque sensing differential

Years 2001–02 Models 1 Factory citations 2

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Also documented for Chevrolet

Documented applications

Firebird — Fourth generation (1993–2002) →

• 2001–2002 ✓ Factory-verified
  ⛭ GM factory document — 2001 pontiac firebird rpo code list, p.1.

  ⛭ GM factory document — 2002 pontiac firebird rpo code list, p.1.

This page aggregates every documented appearance of Y4D in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.