Yep, totally agree, a locked TC reduces tranny temps by heaps and yes the Tranny ECU only locks the TC in Overdrive.
After the mod the ability to lock the TC in 3rd or D and also prevent the Lock Up cycling in OD when rolling on and off the throttle when towing is one of the best things to do for the Tranny IMHO.
I noticed a worthwhile change in fuel economy (mine was a dual fueller) of an extra 50 K's or so on LPG but it would depend on terrain etc an WA tends to be open and flat.
The big difference was the much lower tranny temps when towing my Camper on its generally 1500 to 3000 K round trips
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