I recently replaced my work van with a 2001 E150 Ford cargo van. The
transmission seems to have a couple of extra gears. One below OD but not as
low as drive and another below drive but not as low as second. Can anyone
explain this to me? Bill
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Sure can! It's strange, isn't it.
Here's the normal shift pattern: 1, 2, 3, lockup torque converter, 4.
That's why it feels like you have 5 gears. It actually locks the tc in 3rd
unless you have an unusual load or heavy throttle.
On the AOD this was usually the case, but on the newer and electronic
trannies, you will get TC lockup AFTER the shift to the top gear. Still
feels like 5 gears... six on the newer 5 speed OD units
(A5LD-5R55E-5R44E-5R55N) for Explorer-Ranger-Mountaineer-Lincoln, etc. On
the AOD, you would get TC lockup in third, providing a very odd
half-viscous, half-direct 1:1 drive through the transmission.
The AOD never had a 1,2,3 lockup 4. The converter is not a locking converter.
The AODE does. Also the processor can and will lock the converter in 3rd on all
the transmissions with an electronically locking converter. In the AOD, the
direct drive clutch was driven off the back of the converter housing, not
through the turbine. So any time you are in 3rd you are not only 1:1 but
mechanically linked to the rear wheels being that the converter was bypassed.
When the OD ban is applied now some torque is supplied through the converter
and some through the converter housing at about a 60/40 split.
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