That seems a little high but I know nothing. I have a 700r4 in my truck, I definitly put it in the line coming FROM the tranny and I get a constant 130-140 temps if I'm going, but It'll get to 180 in stop and go traffic and if I hit hills on highway and the converter comes out of lockup, it will skyrocket from 135ish to 180-190 in a second, but cool right off after it locks back up. I also have a 22,000 GVW external cooler ontop of the factory tranny cooler. Just giving you another tranny temp but I know it is from another type tranny.
Ben 87 Jimmy
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