Allison 6sp: LBZ Shift Range Inhibited

[Ne-max]

Having a issue with a customers trans I built a couple years ago using Evan's kit. When it gets to around 150 degrees it will give me the shift range inhibited on the dash. If I put it in neutral and go back to reverse it will go with a slight delay.
Works perfect cold.
No codes
Was trans fluid in connector. Replaced seal and cleaned.
Fluid is bright red.
Shifts and works great in forward gears.
Adjusted cable.
Any ideas?

 

[juddski88]

Check the solenoids

 

[Mike L.]

Check the solenoids

Nothing to do with it.
Shift range inhibited means there was no gear train pull down. What tha means is; Input shaft must stop turning before a TCM commands a gear change. A clutch did not apply to make this happen. Could be a stator body problem or a worn out clutch. Inspection of the sump filter may tell you something.

 

[Ne-max]

Sounds good. I'll pull filter tomorrow. Thanks Mike

 

[juddski88]

Did you find the root cause Luke?

 

[Ne-max]

Not really. Tossed in my spare valve body and it fixed the issue. If I had more time I would had tried valves.