700R4 to a BBC: Requires an adapter? - El Camino Central Forum : Chevrolet El Camino Forums
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Old 12-20-2005, 05:38 PM
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Default 700R4 to a BBC: Requires an adapter?

Looking ahead about a year or so, I have a spare 700R4 that had a 350 SBC in front of it. I want to [eventually] mount the trans behind my 402 BBC.

I'm not aware of any factory BBC TH700R4's, yet I have a 700R4 behind the 454 in my Elky.

I assume the SBC and BBC trans bolt patterns are different. Is an adapter used? If so, what kind of adapter? Will I need a special flexplate to bolt the converter to my BBC's crankshaft?

Or, can the transmissions's bell housing be removed/swapped for one that'll fit a BBC w/no other changes?

Thanks
Mike
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Old 12-20-2005, 05:59 PM
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No adaptors required.
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Old 12-21-2005, 06:49 PM
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Thanks Mrapii.

Then I guess the BBC and SBC bell housing patterns must be the same.

That makes things easy.

Why would Detroit automotive engineers ever do that?

Never mind. Only answerable questions are worth responding to.
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Old 12-21-2005, 09:09 PM
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All Chevy bellhousings bolt patterns are the same, it's the GM BOP transmissions that the bolt patterns differ and you need an adapter plate. Being that GM never made a 700R4 BOP trans this is no longer a problem since GM no longer makes RWD Buick Oldsmobile or Pontiac motors. Now everyone knows what BOP stands for and if you happen to buy a 350TH or 400TH make sure it's not a BOP trans. Maybe this is where the confusion started.
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