Originally Posted by KSCRUDE
I am still a bit confused as you and Smokey list two different gear ratios. But I have herd they do have six gears.
The two lists of gear ratios comes from two different Ford sources. The source I quoted above is the 2004 Ford Truck Source Book, which includes all the specs needed by owners and operators (and salesmen). Those 5 forward ratios are also the ones included in detailed sales brochures. The difference in the two sets of published ratios is simply rounding, except the workshop manual gets more technical and adds another gear between third and direct drive, with a ratio of 1.096. The workshop manual calls that ratio 4th gear, but the Source Book and brochures ignore it and call direct drive 4th gear.
The computer software that controls the tranny never goes through all 6 gears. The average customer doesn't dig into the nitty gritty of the workshop manual. They never "feel" 6 speeds, so they have no reason to question the Ford sales pitch that it's a 5-speed automagic tranny. But James has to work on those marvelous contraptions, so the workshop manual he uses includes the technical details that the 5R100 really has 6 forward speeds, including that extra gear ratio of 1.096 to 1 that's not shown in the specs in the Source Book.
As James has explained above, the shifting strategy gets complicated. Perhaps the Source Book and sales brochures should say:
3rd: 1.55 if freezing cold ATF, or 1.1 if operating temp
4th: 1.00 direct drive
5th: 0.71 overdrive
That's not entirely accurate either, but better than calling the 1.1 ratio 4th gear or in ignoring it as the Source Book now does..