I'm putting my 87 Chevy SWB back together with the parts I have on hand. I have a T350 trans going back into this truck, but I cant remember which torque converter went in it. I ditched a T400 from a parts truck and both converters say 350 on them (hand written with magic marker) I'm sure the T400 was stock, but rumour had it the T350 was originally bolted up to a strong engine once. Is there any way I can tell if one of these converters was a performance aftermarket unit by the markings? The bolting flanges/bosses are different. The one on the left came from the T350...I think.
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