I finally got around to pulling out my OHC6 to do the ST300 to TH350 transmission swap. SURPRISE!...the bolt pattern on the transmissions are not the same. The one on the left is the ST300 trans that was in the car. The one on the right is the TH350.
Now, can someone tell me if there are different variations of the TH350 bolt pattern? This was supposed to be a "direct swap".