95 4-runner auto trans

have had tranny rebuilt, was slipping, they said they also replaced transfer case drum?? Tranny now over heats under load (steeper inclines) on the highway. Blew fluid a few times and checked levels, they were high. corrected and still overheating, any ideas?? Poor rebuild?? Cooler and lines were flushed at rebuild.. Also, has anyone ever seen some sort of vibration dampner attached to the tranfer case, it looks like a tranny mount hanging upside down. Why would it be there?? Are they trying to correct something. Before rebuild tranny never got hot. Thanks for any input, pretty miffed.

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