Texas (6-2, 3-2 Big 12) is bowl-eligible after missing the postseason last year for the first time since 1997.
Texas ran for 439 yards against one of the worst rushing defenses in the country. Bergeron topped 100 yards for the second week in a row and Fozzy Whittaker ran for two second-quarter touchdowns.
The Longhorns completed just two passes in building a 31-6 lead by halftime.
Texas Tech, which broke Oklahoma's 39-game home winning streak two weeks ago, hasn't looked anything like the same team in consecutive blowout losses since the big win.
Seth Doege passed for 381 yards for Texas Tech. The Red Raiders (5-4, 2-4) have been outscored 93-27 the last two games.
Texas played without leading rusher Malcolm Brown, sidelined with a toe injury, and leading receiver Jaxon Shipley who has a knee injury.
It hardly mattered as Texas topped 400 yards rushing for the second week in a row and never punted against a Red Raiders defense that was powerless to stop anything Texas did.
The Longhorns have put up impressive numbers against two of the worst rushing defenses in the country in Kansas and Texas Tech. The Red Raiders came in ranked No. 114 nationally against the run.
Bergeron had 113 yards against Texas Tech by halftime. Texas scored on its first five drives of the first half and ran out the clock on the sixth.
After the teams traded field goals early, Whittaker had scoring runs of 12 and 8 yards out of Texas' ``wild'' formation and D.J. Monroe dashed to the end zone from 12 yards. Monroe faked Texas Tech safety Jared Flannel so well that Flannel ran into cornerback Derrick Mays, taking both defenders out of the play.
For one drive, Texas Tech looked capable of pulling off another big road win. The Red Raiders took the opening kickoff and marched to the Texas 2, but a touchdown pass was nullified by a personal foul.
After giving up the early field goal, the Texas defense never let Doege get comfortable, sacking him four times and hitting him several others with constant pressure.
The Texas running game continues to protect freshman quarterback David Ash, who is still developing as a passer.
Ash's only three pass attempts in the first half came on play-action deep throws to receiver Mike Davis. They connected twice for 72 yards and even when Ash missed a wide-open Davis early, he followed it up with a 47-yard option run on the next play to set up a touchdown.
Bergeron's first touchdown made it 31-6 at the end of the second quarter and Texas kept pounding the Texas Tech defense in the second half.
The Longhorns opened the third quarter with a 10-play drive that used just one pass in driving to Bergeron's second score, a 5-yard run off left tackle on fourth-and-1. Bergeron's third touchdown covered 12 yards early in the fourth quarter to make it 45-13.
Texas has won eight of the last 10 meetings with Texas Tech. The Red Raiders haven't won in Austin since 1997.