Looking for "my last El Camino" and found a possible candidate but . . . there's a couple issues know nothing about and thus can't diagnose the problem. The seller tells me the car (an 86 Conquista) has a 700r4 - 4speed auto trans. He also tells me that the converter leaks when the car sits for a few days but when he starts it up and lets it run a minute or two that it will drive and shift just fine. His mechanic says he replaced "a valve" and it didn't fix it. Could it have been a modulator valve? The other issue is that the column shift lever does not "pop into" park. Could this be linkage or a return spring in the column? Any guidance would be greatly appreciated. I don't know anything about transmission work and even with this little bit of info trying to determine if these conditions might mean major problems or easy fixes.. Thanks a million..