Ok, good, I didn't want to have to get custom tunes just because of the transmission since the rest of my truck is pretty tame (intake, exhaust and guards). The HD4R100 improvements are this:
- Enhanced Torque Converter for better performance and longer life
- Oversize one piece case bushing for improved durability
- Enhanced Forward, Direct, and Intermediate Friction plates for longer life under heavy load shifts
- All new special upgraded steel plates
- Center Support Enhancements for improved gear train life
- Mercon V-OIL for greater heat resistance
- Oversize Pump Gear Set for improved oil flow
- Upgraded Extension Housing Bushing for improved durability
- 45 Element Intermediate Sprag for greater strength to withstand heavy loads
- Special coast clutch drum for improved engine braking and increased durability
- All new iron planetary assemblies for improved durability
- All new one way clutches for improved durability
- All new electronics for improved reliability
- Revised calibration gives better shifts for heavy duty use
- Improved gasketing for reduced leaks