Chuck B 2004 Windsor Posted April 8, 2021 Share Posted April 8, 2021 Keep in mind that the Allison Transmission has a torque converter that comes into play when establishing driving habits. The torque converter will be locked and unlocked depending on how the transmission shifts. Chuck B Link to comment Share on other sites More sharing options...
Jim McGarvie Posted April 8, 2021 Share Posted April 8, 2021 I find this discussion quite interesting, and I am curious how much of it applies to our little 5-speed Allison 1000 with the 5.9L ISB engine. I have experimented a bit with the Econ mode, but couldn't detect a significant difference so I don't use it. On uphill grades I tend to downshift manually when I decelerate to about 1900 RPM, which jumps the RPM up to around 2500. The engine seems happier. Link to comment Share on other sites More sharing options...
Jim McFarland Posted April 8, 2021 Share Posted April 8, 2021 How interesting. I guess I don’t understand why there is such a lag time from when you step on the fuel pedal to the time the engine starts revving up and you start moving. Do all coaches with a toque converters have that issue. Sorry it appears that I have more questions than answers. Link to comment Share on other sites More sharing options...
Ivylog Posted April 8, 2021 Share Posted April 8, 2021 The Alison 3000 & 4000 6 speed transmissions only use the torque converter in 1st & 2nd gears. Starts in 1 unlocked then the torque locks, shifts to 2 unlocked and then the torque locks before shifting to 3 locked, 4 locked, 5 locked which is a overdrive & 6 locked a double overdrive. In some ways it’s a 8 speed tranny. A turbo Diesel engine is slow to get going because the turbo isn’t doing much until you get above 1400 rpms which takes awhile even with a torque converter that lets it increase rpms quicker. 1 1 Link to comment Share on other sites More sharing options...
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