A 7-0 run got San Diego within five, but Gallinat responded with a jumper then 6 of 10 Pacific free throws to secure the win.
Tripp scored 17 points with 11 rebounds and Miles Reynolds added 13 points for the Tigers (14-14, 9-6 West Coast Conference), who have won four of their last five.
The Tigers opened the second half on a 15-3 run to lead 44-27.
Neubauer got USD off to an 18-8 start, making three 3-pointers and scoring 11 points before the Tigers rallied, getting 14 points from Tripp in the first half and leading 29-24 at the break.
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