Popular Cities
2 of these experts are based in Diamond Bar; the others serve Diamond Bar from towns including Fullerton (10 mi), Rowland Heights (5 mi) and Covina (7 mi).
8 open weekends · 22 rated 4.5+ · 1 shows a license
Data verified October 16, 2026
Listed for drivers in and around Diamond Bar, CA, these 24 shops change and flush transmission fluid. What each one says about fluid brands, filters and pricing comes from its own website; ratings and quotes come from public reviews.
The 24 experts on this page are rated from 4.3 to 5.0 across 6,308 reviews; 23 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these experts on specific qualities, they most often praise professionalism (88%), quality (69%) and punctuality (67%). The topics that come up most in reviews of the experts on this page are "price", "diagnosis" and "fair". 8 are open on Saturdays. The services the experts on this page list most often on their websites are wheel alignment (4), auto repair (3), computer diagnostics (3), oil change (3) and brake repair (2). 1 shows a license on its website; 6 list staff certifications (ASE) and 14 have a BBB rating of A or A+. 23 have ten or more years of experience, the longest 46 years. 8 offer financing; 5 give free estimates; 12 are family- or locally-owned and 14 list coupons or special offers. We have a website on file for all 24 of the experts on this page; 18 publish a contact page; 12 list a public email and 6 take bookings online. We count these figures across the experts on this page; distances are straight-line, and hours and prices change, so confirm the details with the expert before you visit.
14 of the 24 shops list a coupon or promotion. A cheap advertised price is usually a machine exchange with a house-brand fluid and no pan work, so check the fluid specification and whether the filter is included before you book.
