Are you sure the tranny has the right dip stick in it? If it is stock, do you know how many pints of fluid you put in it.
If it is foaming, are you sure there is no water in the fluid?
What kind of cooler do you have up front? Does the 4B have the water to fluid cooler on the passenger side of the block?
Where are you taking the tranny temp at? in the hot line going to the cooler or in the pan? If in the pan, I have been told the hot line temps are about 60 degrees higher. I can't say for sure but was told that. My temp gauge is in the pan and I am usually in the 130-160 range I try to keep it below 190 when towing and have Amsoil in it so it doesn't break down as bad when/if it gets hot.