2005 LLY allison range shift inhibited

[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?


Sent from my SM-G935V using Tapatalk

[Mike D]

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?


Sent from my SM-G935V using Tapatalk

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


Sent from my iPhone using Tapatalk

[Andremaxproblems]

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

Sent from my SM-G935V using Tapatalk

[Andremaxproblems]

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

Sent from my SM-G935V using Tapatalk

[Mike D]

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


Sent from my iPhone using Tapatalk

[Andremaxproblems]

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

Sent from my SM-G935V using Tapatalk

[Andremaxproblems]

Stock

Sent from my SM-G935V using Tapatalk

[Andremaxproblems]

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

Sent from my SM-G935V using Tapatalk

[Mike D]

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?


Sent from my iPhone using Tapatalk

[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

Sent from my SM-G935V using Tapatalk

[Mike D]

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

Sent from my SM-G935V using Tapatalk

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.


Sent from my iPhone using Tapatalk

[Andremaxproblems]

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.

Sent from my SM-G935V using Tapatalk

[Andremaxproblems]

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

Sent from my SM-G935V using Tapatalk

[Mike D]

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

Sent from my SM-G935V using Tapatalk

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?


Sent from my iPhone using Tapatalk

[Andremaxproblems]

This was what I put in for replacement

Sent from my SM-G935V using Tapatalk