The Tigers (14-4, 2-0 West Coast Conference) rallied from eight-point deficit with 4:28 to go in the second half to tie it at 64 before the end of regulation.
Tripp’s pair of free throws tied it at 74 with 42 seconds left in the first overtime and he missed a 3-point attempt at the buzzer.
Pacific’s Gary Chivichyan banked in a step-back 3-pointer to tie it at 81 as time expired in the second overtime. Chivichyan made 1 of 2 free throws with 10 seconds left to tie at 91 at the end of the third overtime. Daniss Jenkins made all eight of his free throws in the fourth overtime to help the Tigers pull away.
Jenkins finished with 20 points and Chivichyan scored 19.
Jordan Ford scored a career-high 36 points for the Gaels (14-3, 1-1), who had a five-game winning streak snapped.