It is odd that there are no real e-lockers out there for the 9.75. I guess your only option is to take the rear pumpkin and beef up the limited slip. Then if you have 4WD you could take the 8.8 front end and put an e-locker in that.
On Edit: We have a Detroit Truetrac on my dad's superduty and it performs wonderfuly. It is locked when we need it and unlocks when turning. It is a very solid unit that has no clutchpacks to deal with so pretty much zero maintenance other than changin the fluids at the required times.
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