I have a '93 f150 4x4 supercab with 104,000 miles on it. Bought the truck new in '93. Love it! I have changed the transmission fluid on the truck 2x. Once at 80,000 and once last week when this problem became apparent. It shifts hard into second gear, sometimes, seems to do it more often lately. Especially at low speeds. Also seems to jump a little at low RPM going up hills. Fluid has always looked good. Any Ideas short of an overhaul? Thanks.