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Old 04-14-2006, 03:44 PM
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If it originally came with a 400 you can measure from the block mating surface back to the driveshaft yoke (where its polished from the seal). Compare that measurement to the overall measurements of TH400s found on this site:

If it didn't come with a TH400 originally, pick which ever one you want because you'll need to shorten your driveshaft and use a different yoke anyway.
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