Wacker became head football coach of Texas Christian University after the 1982 season. He had early success at TCU. In 1984, his team was ranked as high as #12, the TCU Frogs' highest ranking since 1960, and was invited to the Bluebonnet Bowl after an 8–3 record in the regular season. The #12-ranked Frogs lost a showdown for the Southwest Conference title with the #10-ranked Texas Longhorns on November 10 in what remains the third best-attended game in the history of Amon G. Carter Stadium. After the season, Wacker was named as National Coach of the Year by ESPN, the UPI, and "The Sporting News". He was awarded the 1984 Bobby Dodd Coach of the Year Award.