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Discussion Starter #1
I have been reading aobut adding an overdrive lockout switch for the Allison. Then I read onthis forum that you can hold the tow mode switch in for 5 seconds and over drive will lockout. I tried that last night and here is my sequence:


started truck


pushed tow mode (light comes on)


pushed and help for 1 second (Overdirve locked out - light came on)


pushed again for 1 second (over dirve lockout off)





The question -- did GM add the lockout on 04's and my sales guy did not know it? (not surprised) I was all ready to add the switch and then found this procedure. Anyway, not complaining that I don't have to add a switch just confused (which my wife says is normal for me).


Don (gearing up for the 2500 mile spring break fifth wheel hauling vacation to MickeyLand) Miller
 

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Yes, GM added this feature in 04.


Your owners manual will tell you all about it too.



Push the button once breifly it will go to tow/haul mode.


Push and hold the button for about 3 seconds it will go into O/D lockout.


Push it in breily again it will go out of tow/haul mode.


Push and hold it again for 3 seconds it will go out of O/D lockout.
 

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well i also have it on my 03
 

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Discussion Starter #4
REad the Owners Manual....That's just not Natural!!!





Don (Sometimes I long for the old days of push button transmissions) Miller
 

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I know...I know


I don't either until the last straw, but when you do, sometimes you can find interesting stuff!
 
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