excursion 6-speed?

Reply Subscribe

Thread Tools

Search this Thread

Feb 7, 2009 | 08:40 PM

#16

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,698

Likes: 2,620

From: SE Florida

Quote:

Originally Posted by mikeraymond

[FONT=Tahoma][SIZE=3] When cold it skips 5<SUP>th</SUP> to use higher revs to give it a quick warm-up to reduce emissions and increase fuel economy.

It skips 5th when cold (below 0F) because we couldn't make it shift 3-5 when it was very cold. The 3-4 shift is MUCH easier to make.

Quote:

Originally Posted by mikeraymond

When you push the tow-haul mode button you will notice that it uses all 6 gears.

It NEVER uses all six gears, even in tow/haul.

There is no time that it would make sense to shift 4-5. That would be shifting from 1.09:1 to 1:1. That's a 9% drop. If that shift were made at 3000 RPM you would get an engine speed drop of 270 RPM, but in reality it would be less than that because the torque converter will absorb some of the RPM drop. So you'd be making a shift with less than 200 RPM drop.