Join Date: Jun 2001
Location: Greeley CO
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Re: TH400 not holding in park
If memory serves me correctly, the park "paw" is in the back of the tranny under everything, but not inside the rear housing/adapter. I think you can see some of it from the bottom when the pan is removed.
Double check the linkage. It should move fully to park position with some extra force.
When parked, there is a lever that moves over a grabs a cog type gear on the output shaft, thus locking the shaft to the case.
it is moved by a rod connected to the shifting shaft. This rod is spring loaded to the lock lever. That way if you hit park while still moving, you hear grinding before the lever grabs a tooth.