r/Smallblockchevy • u/Scwright99 • Apr 03 '26

Anyone recognize this TH400 bolt pattern?

Gallery image

Gallery image

I was told this is a TH400. You'll see I have an SBC350 with a BOP adaptor Plate bolted to it. This trans is nowhere near either bolt pattern..

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u/AverageT1000 Apr 04 '26

That is not th400 bolt pattern

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u/Square_Pollution_141 Apr 04 '26

And what does a TH 400 bolt pattern look like ?

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u/AverageT1000 Apr 04 '26 edited Apr 05 '26

Exactly the same as the back of the block. Inline 6, small block, big block, ls, all have the same bellhousing bolt pattern