Whether you're coming in for diagnostics or a full transmission replacement job, Deltrans walks you through the process and does not spend any of your money until you approve the work to be completed. Deltrans is a leader in the transmission industry with a number of patents to increase the quality of the transmission product we provide. Whether you're coming in for diagnostics or a full transmission replacement job, Deltrans walks you through the process and does not spend any of your money until you approve the work to be completed. Deltrans is a leader in the transmission industry with a number of patents to increase the quality of the transmission product we provide.