![]() Easy to spot when looking at the flywheel. But why do that when you can just use the T350 converter and actually pick up a little stall speed? As mentioned most BBB's have the dual pattern for both size converters. Well, as mentioned you can do a "reverse" stall converter by using the T400 converter which are usually 13" units. You should look at your existing converter to see what the bolt circle diameter is, and how the converter is mounted to the flexplate. ![]() Pretty sure Oldsmobile does this, but I don't think they're the only ones. The Chevy style converters don't fit the OEM flexplates for some other divisions engine families, because the Chevy brackets won't clear the balance weight welded to the flexplates. Other GM divisions used threaded standoffs on the converter, no nut required. "Chevy" applications tended to use a bolt-and-nut arrangement, the brackets on the converter allowed for a nut on the back side. The bolt circle diameter-and mounting method-will vary depending on what converter core and flexplate is used. Of course, the "Switch-Pitch" TH400 converters, and the TH350C converters won't interchange with each other or any other "regular" 400 or 350 converter. ![]() ![]() Lots of guys went the other way-installing a TH350 converter on a TH400 for less rotating weight and maybe a tiny increase in stall speed. There's always exceptions, but the OEM TH400 converters tended to be an inch in diameter larger than TH350 converters. ![]()
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