I suspect the trans temp was high due to it having no boost and you having to apply a lot of throttle to maintain a speed, therefor stopping the torque converter clutch from locking up. This will heat up the trans in no time, especially towing. Te service 4WD light is very common and without checking the codes, I'd bet the codes relate to the rear diff motor and 4WD control module (transfer case control module) under the passenger seat. The diff motor is hideously expensive from Jeep and the module is not too bad but from what I have seen, stock is hard to come by. I ordered the diff motor and module from mopar online, had it in a week and installed in about 2 hours with basic hand tools. FYI, Jeep quote $3000 to do this job. I'm based in Dandenong so if you need some help with this, without the dealer bullshit, then give me a call - Matt - 9793 1616 B/H
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