Transmission Questions...???
Hi, This is somewhat of a followup to my post about towing in the mountains with a gasser. In that post I saw a lot of talk about different transmission designs, how they have changed over rec...
Forum Discussion
Quality and longevity are very important in a transmission. Function is also right up there in my book.
All of the manufacturers have changed how their heavy duty transmissions operate to make driving easier and safer. Tow/haul mode does that.
When tow/haul is engaged the operating parameters of the transmission change. In general terms the transmission will upshift at a higher speed, and may downshift automatically to help prevent the vehicle from speeding up while coasting. These functions first appeared around 2000-2003. Computer controls made it possible.
Downshifting will use engine resistance to help slow the vehicle. This is especially helpful when driving downhill with a load. This takes a large load off of the brakes, so they can stay cool and be ready for when they are needed.
Having worked on the Ford TorqShift transmission I won't agree that the Allison is superior. ;-)
All of the manufacturers have changed how their heavy duty transmissions operate to make driving easier and safer. Tow/haul mode does that.
When tow/haul is engaged the operating parameters of the transmission change. In general terms the transmission will upshift at a higher speed, and may downshift automatically to help prevent the vehicle from speeding up while coasting. These functions first appeared around 2000-2003. Computer controls made it possible.
Downshifting will use engine resistance to help slow the vehicle. This is especially helpful when driving downhill with a load. This takes a large load off of the brakes, so they can stay cool and be ready for when they are needed.
Having worked on the Ford TorqShift transmission I won't agree that the Allison is superior. ;-)
