Trust Your Littleton Colorado Transmission Repair Team At Advanced Transmission. We offer the best automatic transmission repair services in the Littleton area. We can offer a free transmission diagnosis. All of our work is done with safety in mine. Our 2 year, 24,000 mile warranty come standard with any automatic transmission rebuild and we can offer a 3 year, 100,000 mile warranty. To learn more about our transmission repair go to www.advancedtransmission.com today!