Allison 6sp: LML Out of Gear

[Blaine]

I have a 2016 LML cab/chassis that is completely stock. When it goes down a hill (or more like over a bump) sometimes it will kick out of gear. The truck spends a good part of the day on the road and it really concerns me, has already put the driver in a bad spot.. For the record, I think it might do it more often on a cool morning. I have not noticed any excessive metal shavings or anything on servicing.

 

[M.A.M.]

Sounds more like the converters unlocking.


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[Blaine]

What would cause that. Just simply a wore out converter? Truck has les than 80k

 

[juddski88]

Do you have a diagnostic tool?

 

[Blaine]

I have a V2

 

[M.A.M.]

If the traction control kicks in, the torque converter will unlock. If you’re going down a hill and the torque converter is holding back, and your rear wheels go over a bump, it can feel like its jumping out of gear. Best thing to do would be watch the lock up and gear position on a scanner.


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[Blaine]

Is there anyway to disable that feature on traction control

 

[Hoser]

Press the traction control button to turn it off, press and hold to disable traction control and stabilitrak. It’s all explained in the owners manual.

 

[Blaine]

I was meaning permanently..

 

[snowman22]

I was meaning permanently..

Nope, and stabilitrac will turn back on after 35mph no matter what you do. I just have a habit of disabling traction control every time I get in.

 

[AZlml]

What module controls traction control and stabilitrac, TCM? Let's say if one wanted to have it tuned out, is it as simple as disabling it through efi?

 

[Mike L.]

What module controls traction control and stabilitrac, TCM? Let's say if one wanted to have it tuned out, is it as simple as disabling it through efi?

I would never take it out. It saved my ass a few times. Shit works good.

 

[Hoser]

I literally turn it off EVERY time I get in the truck. The truck drives different with it off and I drive with the rear end a lot, especially in the winter. I’d remove it in s second if I could. Having it off has saved my butt.