LT5 (AU) ● Confirmed

Cadillac · Regular Production Option

High-altitude package

Years 1974–78 Models 2

Also described as High-altitude performance package

Documented applications

DeVille / Calais →

• 1974 ● Confirmed

  New

• 1975 ● Confirmed

  All

• 1976 ● Confirmed

  All

• 1977 ● Confirmed

  All

• 1978 ● Confirmed

  All

Seville →

• 1977 ● Confirmed

  $22

This page aggregates every documented appearance of LT5 (AU) in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.