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Automatic transmission overhauls in Redding, CA and all surrounding areas Hartnell Transmission is a full service (car and truck) transmission specialist with over three decades of proven experience at the same location. We have built the business (from the ground up) starting in 1985, always taking great pride in our customer care and quality of work. With a solid reputation for delivering reliable transmission work (from routine maintenance, repair, overhaul, to the complete replacement).