How do I tell what type of automatic transmission I have on my 1993 F-150? I have the overdrive push button on the end of the gear shifter. I am having some weird things happen with it. Sometimes it shifts really hard going into second gear. Sometimes shifting in the higher gears, the engine RPMs go way up to about 4000 and then all of a sudden the tranny will catch. Other times it works great! Any ideas?