I have a '89 gmc sierra 350ci. It has a four speed (three with overdrive) automatic transmission. What kind of tranny is it? A 700r4? Or something else?

its probaly a 700r4... im pretty sure the 200r4 was never put in fullsize trucks (someone correct me if im wrong)

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68 4x4 short fleetside deluxe cab 327 air
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64ImpalaSS 68 large journel 327 turbo 350

It is a 700R4 transmission.