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Odd, very odd. There should be no difference between park and neutral on a TH400. (Except park has a pin that engages) IIRC the Humvee version doen't even have a "park" position. I would drop the pan, change the screen, check linkages etc, put in fresh fluid and go from there. (Side note...

I thought I broke a TH400 once........................ Turned out that It had twisted the insides of the Summit Racing torque convertor into shrapnel! even though a TH400 is very tuff I'd only use low range plowing with a 1009 due to the gearing. The most expensive part of the rebuild is...