Our automatic transmission pans from Mag-Hytec and PPE are engineered to maintain lower transmission fluid temperatures, effectively extending the life of your fluid. Moreover, our upgraded flex plates are built to manage increased power, facilitating superior power transfer from the torque converter. If you’re in need of automatic transmission shafts with hardened input, output, and intermediate shafts, we offer a substantial upgrade over factory transmissions.

For those with manual-style transmissions commonly found in older diesel trucks, where the driver selects gears manually, RDP provides Manual Transmission Shafts to enhance your transmission’s durability and performance.

At Rainier Diesel, we offer a comprehensive range of products to keep your transmission running smoothly. Discover top transmission fluid brands such as Royal Purple, Lucas Oil, and Champion to meet your automatic or manual transmission fluid needs. We also carry replacements for worn-out manual transmission hydraulics, along with manual transmission clutches from Valair or South Bend Clutch, available with single, dual, and triple clutch plates to accommodate varying power levels. Trust RDP to keep your transmission in optimal condition for your driving needs.