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Wow, it leaks that bad? have you tightened all the nuts and bolts to correct ft-lbs or in-lb's? Whens the last time you did a tranny fluid drain? the gasket could be bad and it's leaking.
As far as auto's go, getting it to shift earlier is to quickly let off the gas and go back to the throttle you had before, before your speed drops too much with rpms and it's too low rpm's to shift.
I don't have an overdrive shift position, but I do have an O/D off button on the dash near the steering wheel and near the rear window defrost. I've only used it when i got it (The Jeep) to see if everything was working right.
Also, another good way is to find out when everything shifts at. For mine I can do the throttle pulse and shift at these speeds:
1st-2nd: 15
2nd-3rd: 25
3rd-4th: 35
4th-O/D: 50
What you wanna do with the cold engine/tranny situation is get through your gears as quickly as possible, and by quickly I mean accelerate as slowly as possible and let your engine shift when it wants. You live in similar weather that I do, and I go there every summer, so I know about that too. In the morning, I go to about 1750 rpm and it shifts around there, and when it drops below 1500, let it slowly go back up to 1750 rpm, where it will shift again.
I don't know when yours will shift if you accelerate as slow as possible, but find that rpm, and go that fast until it shifts. You want to go as fast as you can with the lowest RPM's you can, it won't give the engine hell, it'll warm up the engine and you'll get better mpg's.
You said you have the heater off and special rad-block is installed. Best advise, do a grille block. I got one hole in my lower grille block the width of only about a 2x4 inch rectangle, but going down the highway the temp would DROP 20-30 degrees, just from that amount of cool air comming in. If I blocked the whole upper top grille, I'd be warming up even faster, and keeping warm. do one from something, cardboard spray painted to the cars color will work. I'm using duct tape. Do something to prevent cold air from cooling the coolant in the RAD.
I'm strapped for time, so I gotta get heading out. good luck!
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