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Dear Santa!

No... My first OEM orignal failed closed and started to get to hot. Kind of hard when its got a spring pushing the valve closed. Unless the spring fails. Normal. If your reaching this temp your fine. Take the truck out for a ride. Return home and carefully open the care with a rag. Remember this is under pressure and could contain hot water. But once you got the cap open look and see if the coolant is moving. Also is the upper hose the same time as the thermostat housing? The lower hose or the cap side will always be considerably cooler. Another suggestion is to replace your thermostat every time you flush the system this just makes sure there is no future problems.

ECM will not allow it to shift into OD until the coolant temp is around 140* IIRC. Edit;I see you have a 96 what I posted is for newer 47re trannies not the older 47 rh like you have.