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And if it's a 3.0 van, you could find a 3.0 5 speed manual car

KOG said:
We've done one 604 to 670 replacement. Easy, but you do have to get a 670 from a minivan, not one of the car versions. And you will want to rebuild it before installing. If it's a 3.3 you cannot use a 670, three speed never made with that bellhousing pattern, only fits 3.0.
And you could also do the same swap to a 5 speed manual providing it's a 3.0 powered van. You'd really need both a 4 cylinder 5 speed van for the shifter and pedals and a 3.0 5 speed car for the transmission.
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