Ok having had my 87 runner a bit longer now, about the shifting issue with the A340H, if the fluid you had in there before you changed it was old, it was likely thin and lacking viscosity, making it easier to pump. Auto trans is basically a big pump. Putting new fluid in it with good viscosity...
It sounds like you may be needing a new clutch, but do check on that tune up. Plugs wires cap rotor and your air and fuel filters. If it is the clutch is on it's way out, that slipping will slowly work it's way down to first gear where you will have to rev the hell out of it just to get going...
Here's the deal. Toyotas are supposed to use dextron 3 ATF. Great stuff...exept that it is a very high detergent formula. That is why you don't want to change a bunch of trani fluid on a high mileage trani. As said before, if regular fluid changes are done, all will be well. But if not, the...