ZW4 ✓ Factory-verified

Chevrolet · Regular Production Option

Base 4-Speed Wide-Ratio Transmission (standard)

Years 1969–80 Models 5 Factory citations 2

Also described as Base 3-speed transmission codeStandard TransmissionStandard 3 speed transmission3-speed manual

Documented applications

Camaro →

• 1969 ● Confirmed

Chevelle / El Camino →

• 1971–1972 ✓ Factory-verified

  footnote-flagged in source (Canada/export, build-sheet/tag-only, documentation-only, or package base engine not reported as an option — see chevellestuff legend)

  ⛭ GM Heritage factory kit — 1971 Chevrolet Chevelle, p.62.

  ⛭ GM Heritage factory kit — 1972 Chevrolet El Camino, p.6.

Corvette (C3) →

• 1972 ◑ Single-source

  $0.00; count n/a (CAC only)

Impala / Full-Size →

• 1970 ● Confirmed

C/K Trucks →

• 1973–80 ◑ Single-source

  Modern lists reuse ZW4 (glass pkg)

This page aggregates every documented appearance of ZW4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.