New truck with Allison 4000 transmission problems.

Fluorescent as in coolant? That would be a problem.

 

Sometimes they'll throw UV dye into oil to help ID a leak. GM did that to my pickup when it was new due to a leak. Flash forward to 80,000km and the local transmission shop calls me up to ask if I ever had dye put into the transmission because the old fluid was fluorescent orange when he did the transmission filter change.

 

If the filter was plugged, she might be toasted. A relative had a pickup with a 4L80E auto and it started acting up after about 20,000 km. Dealer replaced the speed sensor a bunch of times over the next 5,000 before finally pulling the tranny. Found everything inside was melted. No idea how the truck even drove.

 

Spin on Filter should have been serviced very early. If it's plugged that's VERY bad on a Allison!
Damage has been done.

 

Someone put the wrong fluid in it? These things don't use ATF. We've got a few oilfield trucks with the 4500 Allisons, and they're relatively bulletproof as long as they're serviced at the appropriate intervals (50K miles for us, severe duty, 24/7 operation).

 

Stucking ih 5th gear usually not related with incominated fluid/

it is solenoid valve problem

Use Allison DOC software to actuate valves one by one and check bad valve by sound.

Check also VSS and TPS data!