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I have a 2001 with 87,000 miles, running an Edge with the attitude. Tows a 15,000lb 5th wheel. The problem I'm seeing is for about the first 5 to 7 miles after taking off, the alison will not go into the lock mode in 5th gear, even if I press the tow/haul button it won't lockup. After it warms up a little it shifts fine. This all started after I had the Transmission oil changed. I had transyd in the transmission and had them do a transfusion to amsiol synthetic. Since then I have had this problem. Could it be the amsoil or because they had not changed the filter in transmission. Any help would be appreciated.

Thank You
 

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Mine does the same thing. I just figured it was because the trans hadden't warmed up. Not sure though.
 

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Mine also does the same thing. Although I have just normal fluid that the dealer put in when it was in for service. As you can see on my signature I also have the edge with att. I don't know if it did that before I got the edge i never paid attention to it. Here is a quote off a web site on the sticky of the allison OEM page:

Operating Characteristics

There are a few "quirks" with the Allison LCT 1000 that you should be aware of, especially cold weather driving. The transmission has the ability to perform some tricks to help heat itself up when cold. Some of the strategies are;


- 49 degrees Fahrenheit or below the transmission will not go anywhere until the temperature sensor tells the TCM it is above this specification. A P0713 may also set.


-31 degrees to -49 degrees the transmission will operate in Second Gear and Reverse only, this makes the transmission work harder and heat up faster. There will also be no TCC.


From -13 degrees to -31 degrees you will have Second, Third and Reverse with no TCC engagement available.


From -4 degrees to -13 degrees there will be First through Fourth Gears and Reverse with no TCC.


From +71 degrees to - 5 degrees there will be First through Fifth Gears and Reverse but no TCC lock up.

Some other operational characteristics to be aware of are a hum at idle due to the large capacity gear pump, first and second gear set noise, firmer shifts and a click in Park during start ups (this is caused by the valves moving).
 
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