Ford F53 Question

tderonne wrote:

Hikerdogs wrote:


Here's some information about the Torque Shift transmission that may answer some of your questions. Keep in mind your older motorhome had either the E4OD transmission or the 4R100. Neither of them had the Tow/Haul feature. The button on the end of the shift lever locks out overdrive. It didn't do anything else.

It's a 5 speed transmission rather than the 4 speeds available with the 4R100, although, the top three ratios are the same. There are several other key differences between it and the previous generation 4R100 transmission.

1. Putting it in tow/haul does not lockout overdrive.

2. When in the tow/haul mode it does delay the upshifts somewhat and increases the oil flow through the transmission to keep the temperature down.

3. This also reduces the transmissions need to "hunt" for the proper gear when ascending hills.

4. When descending a hill if you take your foot off the accelerator the transmission will provide engine braking without the need to manually shift out of overdrive.

5. Also when descending a hill while in the tow/haul mode you can make the transmission shift to a lower gear by depressing and releasing the brake pedal. It will downshift to a lower gear about 1 second after releasing the brake pedal.

6. It will shift down another gear each time you depress and release the brake pedal as long as the Powertrain Control Module sees the engine will stay below the maximum RPM level.

7. It is not necessary to use the tow/haul mode when towing on flat ground.

All this information is included in a handout from a Ford factory rep who was giving a seminar on the features of the F53 chassis at the Winnebago Grand National Rally last July.

Fixed a couple little things above, in italics.