Owned and operated by Jack McGee in Colorado Springs, Jacks Transmissions rebuilds performance transmissions and engines while also running a full-service automotive repair center. The shop is known for taking on complex vehicles and for its unusually disciplined in-house process, with separate teardown and clean assembly areas, extensive parts-cleaning equipment, and engineering-focused staff. It also sells specialized driveline parts and backs its work with a 14-month unlimited-mileage warranty.