Trans Swap - Future Planning Question

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Old May 18th, 2024, 06:11 AM
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Trans Swap - Future Planning Question

I have a 67 Cutlass, 330, 2 barrel and ST-300 trans. I am looking to further my education as to which direction I'll eventually go.

I know that there are BOP TH-350's, is that the same for either the 200R4 or 700R4? Or do you buy a regular GM one and convert/adapt the bell housing to fit the Olds?
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Old May 18th, 2024, 08:05 AM
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Most 200-4R are either BOP or universal pattern.

700 are Chevy-only bolt pattern.

Both have "shortcomings" in stock form but the aftermarket has improved them a lot.

Neither may be particularly easy to find now.

I think for overall ease of swap the 200-4R is a better choice. It has good gear ratio spread (700 has a really WIDE spread between 1st and 2nd), bolts right up to a 330 and is easy to make the converter lockup function. The TV cable and bracket are not hard to find for a QuadraJet-equipped engine but IDK what you'd have to do to get it to work with a 2-barrel.

On either, you might get into some weirdness with the shifter detent plate going from D L to D321 especially on a column shift. I think detent plates are available for floor shifters.

Last edited by rocketraider; May 18th, 2024 at 08:08 AM.
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Old May 18th, 2024, 08:18 AM
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To clarify a little, most 200-4R transmission cases are unisex. Only very early ones came as BOP-only. You'll have a tough time finding one of these.
The 700R4 comes in both Chevy and 60 deg metric bolt patterns, the latter used with the 60 deg Chevy V6 engine family in F-body and S10 applications. The Series III Buick 3800 blocks also came with that bolt pattern and used this trans in the fourth gen F-body cars. You'll want the traditional Chevy pattern bell to use an adapter.
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Old May 18th, 2024, 12:39 PM
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Originally Posted by rocketraider
The TV cable and bracket are not hard to find for a QuadraJet-equipped engine but IDK what you'd have to do to get it to work with a 2-barrel.

On either, you might get into some weirdness with the shifter detent plate going from D L to D321 especially on a column shift. I think detent plates are available for floor shifters.
I was able to navigate this exact scenario (200-4R & TV connection to a 2 bbl & column shift for a ST300). Check the link in my sig for how I solved it. Key ingredients were a BTO ROCHESTERSINGLE TV cable kit and a Kugel KK02 column shift adapter kit. The PRNDL indicator isn't accurate, but all the 200-4R detents line up w/ the column shift gates (which helps avoid accidental tossing it into REV when upshifting, etc). I just have to count the detents to know what gear I'm in (I plan on eventually replacing this setup w/ a proper floor shift for this trans). TC lock-up control was solved with the BTO TCCRELAY200 kit.
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Old May 19th, 2024, 08:07 AM
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Thanks guys!

I probably should have said that I will be putting a 4 barrel intake and carb on this car too. I don't know if that matters when doing the trans swap or not.
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Old May 19th, 2024, 09:44 AM
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Originally Posted by Taz54904
Thanks guys!

I probably should have said that I will be putting a 4 barrel intake and carb on this car too. I don't know if that matters when doing the trans swap or not.
BTO offers a variety of TV cable adapter kits for many different carbs. These are the adjustable variety that uses a cable cam that is attached to the throttle shaft. Your new carb may already come w/ a TV cable attachment feature, in that case you're already set.
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