Fluid Choices

First, in '98 our 727 we used mobil atf, one summer (2000 mile), it leaks all over, gears went when ever they want, then we start use Mopar atf 3, no leaks, firm shift, and good warm keeping, this autum we change a valvoline atf, leaks all over and shift is not so great...
727 we use is made for streetdriving with a tci converter 2500-2800 stall...
Do those transmission oils have that kind of diffrent or is our 727 just be broken? :shock: