1. 

   No Lift Platinum Level Contributor

   I believe it is the smaller pattern if it is a 350 because it would have come with a T350 trans which uses the 12" converter. The stock T400 13" converter uses the larger pattern.

    

   No Lift, Jul 13, 2017

   #41
2. 

   Gary Farmer "The Paradigm Shifter"

   It's the smaller one. TH350 and ST300 (non-sp) use the same converter/bolt patterns. TH400/TH375 used the larger ones. (factory stuff)

    

   Gary Farmer, Jul 13, 2017

   #42

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