2005 LLY allison range shift inhibited

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  • 2005 LLY allison range shift inhibited

    Serviced my allison the other day with transynd and external filter. After fluid change I am having issues getting it in Reverse and range shift inhibited message comes up. Any idea what is going On?


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  • #2
    Originally posted by Andremaxproblems
    Serviced my allison the other day with transynd and external filter. After fluid change I am having issues getting it in Reverse and range shift inhibited message comes up. Any idea what is going On?


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    Hi Andremax,
    Is your truck new to you? Is this the first time you have ever had a shift range message?


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    • #3
      I bought the truck at 130k miles and it has 207k on it npw. First time I got shift range message

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      • #4
        I got the transynd and spin on filter from you guys. It didn't act up before I changed the fluid.
        Will over filling it cause this to happen at all? I may have put a tad to much back in her

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        • #5
          Do you have a stock trans pan which would be a shallow pan?


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          • #6
            Yes stock. The pan is just slightly under the frame so that has to be a restock pan

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            • #7
              Stock

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              • #8
                Just to give you an idea I got the 2 gallon service package and used less than 2 gallons. It is showing high on the dipstick. The problem seems to be getting worse. At first it only would not go into R in the morning and now it is all the time when it's cold or up to temp

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                • #9
                  Hmm well can you post a
                  Picture of the pan please?
                  Also do you know what the NSBU switch is and where it's located?


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                  • #10
                    NSBU switch is the single plug model and it's on the driver side transmission. I did replace it with a new one because I thought that was the cause of my problem

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                    • #11
                      Originally posted by Andremaxproblems
                      NSBU switch is the single plug model and it's on the driver side transmission. I did replace it with a new one because I thought that was the cause of my problem

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                      You replaced it after you serviced the trans and your Shift Range message's started?
                      Please post image of your pan or take measurement of the pan depth from mounting surface.


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                      • #12
                        I am out in a big rig right now so can't post picture right now.
                        I serviced the tranny and then my problems started. I was reading online about the NSBU and then I replaced it. With the new NSBU the problem was still the same.
                        Therefore I think my problem started after filling with the transynd.

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                        • #13
                          Thanks for your patience. I will get a picture on here when I get back to my truck. I appreciate the help

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                          • #14
                            Originally posted by Andremaxproblems
                            Thanks for your patience. I will get a picture on here when I get back to my truck. I appreciate the help

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                            Sounds good. I just want to eliminate that the previous owner may have installed an Allison deep sump pan.
                            The issue your having is not normal for just a fluid exchange.
                            Also did you put a genuine Allison or GM NSBU switch in?


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                            • #15
                              This was what I put in for replacement

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