I am pretty sure the engine ECU controls the transmission.
You can buy aftermarket transmission controllers but they are only for US transmissions and are $2500 when I looked . You would have to revert to a 4HP22 from a Disco or Classic which has hydraulic control..
I also think thereis a lot of interface between the engine ECU and alarm and body ECU, and suspension . immobilisation, suspension operation, aircon etc.
I suggest you talk to anexpert like Graeme Cooper as he often has to sort out problems with these things.
I have often wondered whether you could strip all the computers out of a P38. Graeme Cooper says not economically
regard s Philip A


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