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86 toyota van: auto trany,will not shift in to higher gear,unless the motor is hot?

have 86 toyota van/le/4 cyl-automatic[no 4 weel drive] with over 250 miles.trany has been rebuilt twice- changed the fluids-filter

problem: the trany will not shift in to higher gears unless the motor gets hot. i have to let the engine idle for 5 minuts, then the trany will shift in to higher gears, other wise if i start it up put it in drive, it will not get out of first gear? untill the motor heats up, once the motor heats up,then the trany shifts ok?