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Solenoid was fine, replaced it anyways, new filters, gasket, etc, found pin connector related to C5 solenoid at harness to controller was loose, female pin connector was spread causing loss of contact, problem solved, Allison trannies are **** near flawless, it's usually wiring!

Here's a peek, I had a similar problem, found out it was a harness pin issue, changed out C5 solenoid, the solenoid body is very heavy, like 75 lbs