John Bland is a highly skilled transmission builder, known for his expertise and attention to detail. With years of experience in the industry, he specializes in creating high-performance transmissions that meet the unique needs of each vehicle. Whether you're looking for a custom build or a reliable repair, John is to providing top-notch service and quality craftsmanship. Discover more about his and how he can enhance your vehicle's performance today!

The Tommy Built Collection

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At Certified Diesel Transmission, we take pride in the quality of our work and the reliability of our products. That's why we offer a comprehensive warranty on all transmissions we sell. Our optimized stock transmission comes with a 3 year, 100k warranty, while our stage 2 and 3 transmissions come with a 2 year, unlimited mileage warranty. Please note that for stage 2 and 3 transmissions, transmission tuning is required, and a hot flush must be done upon installation.

The Tommy Built Collection

4l60E Chevy 4 speed 1998-2007 Gm truck and SUV

46/47 RH 1988-1995 Ram Cummins

4R75 W/E 4R70 W/E 1993-2011 Ford trucks/suv/work vans/mustangs

47/48 RFE 1996-2007 Ram Cummins

Stage 2 4L60

6L80/90 With Updates and billet converter preprogramed TECHM

Callahan 700 68RFE

Callahan 500 68RFE 2007-2024

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