I am proposing to swap the faulty 722-359 transmission in my 300TE-24 (104 engine) for the good 722-320 trans from my donor car (86 300TE (103 engine)). I know the governors & valve blocks are different but the shift points seem virtually the same as in my other 300TE. The only external difference I can see is the addition of wires to a plug secured by a screwed retainer just forward of the modulator on the 722-359. Does anyone know what this is for and whether I can run without it? (Or even if I can swap whatever it is from the 359 to the 320). I have the ATSG service manual but can find no reference to it.
None of the cars is fitted with a catalytic converter if that is relevant.
Any help gratefully received.

Adrian

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90 300TE 24v (M104 eng) 207K miles
87 300TE (M103 eng) 269K miles (and never had the head off!)
86 300TE (M103 eng) 230K+ miles (donor car)
95 Toyota Lucida diesel 4wd
86 200T 165K miles (sold)