TOD Pulsing

'99 Trooper. When TOD is engaged in 4WD High, the TOD is jumping in and out of 4WD even on hard pavement moving straight ahead. This
happens on sand when the wheels slip so something is obviously wrong here. I've checked the TOD fluid level, it's fine. I reseated the electrical connections on the TOD Computer under the front seat, and on the front and rear speed sensors on the transfer case. That did not fix it. I suspect either the TOD computer is shot, or one of the speed sensors isn't working. Anyone know how to check these?
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