Golden_HVAC wrote:
This might prevent a current problem, the transmission overheating while backing up with a larger fifth wheel attached. The transmission heats up mainly because it is not turning more than a few dozen revolutions on the output shaft in a minute, but the input shaft needs to turn 900 - 1800 RPM to develope enough horsepower to move a larger trailer onto leveling blocks, or to get it up a steep driveway.
Fred.
The transmission heats up when backing because of torque converter slip, not the ratio between the input shaft and output shaft. That's just gearing, and compared to the heat the torque converter generates, the gearing generates almost negligible heat. The other contributing factor is little or no airflow over the cooling system when backing.
A higher (numerically) reverse ratio will help keep the trans cooler because the torque converter won't have to work as hard, so it won't generate as much heat.
