Budz
12-27-2002, 20:29
Thought this might be interesting reading for all of our cold weather friends. I ran across this at GM Service Technical College. Maybe it has been posted before but I haven't seen it. Might save you a needless worry and trip to the dealer.
"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)."
Budz
2003 D/A CC SB
"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)."
Budz
2003 D/A CC SB