Forest, I don't think that there is a way to take it out of lockup manually. Even if there were, I don't really think you would want to do that. When the automatic is unlocked, the transmission temperature will start to climb and fuel mileage will drop. When the transmission temp starts to climb, the engine temperature will be adversely impacted since the transmission cooler will increase the engine radiator temp.
Your engine temps are perfectly normal for an 8V92. Actually quite good. Climbing a steep grade during hot weather can easily send the temperature up to 205+. Keeping the engine temp below 203 is a very good thing. Letting it get above 210 is an extremely bad thing.
Lugging the engine is bad. Lugging is frequently defined as having the engine in a state where applying additional throttle will not cause the vehicle to accelerate (or conversely the engine will no longer maintain the current speed with full throttle). If you are truly lugging an engine, it is better to slow down and let the transmission downshift. One of the disadvantages of a 4-speed transmission is the significant drop in speed necessary to downshift. One of the advantages of the Allison 4 speed is that it is one tough transmission.
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