Ok, Im still working on that 90 wagoneer, 4.0, aw4 auto, np242, d30 and 35. Three inch lift, 31's. Seems like at highway speeds, the converter is not locking up like it should. I just assume it is supposed to lock up like every other overdrive Ive ever driven. Is this the transmission, the converter, or maybe just a sensor? Any and all opinions on this will be greatly appreciated, as I am at a loss for the moment. Thanks...